There is no way to make the space key/bar on the Pyra an easy target for both thumbs. You could have a centered double-width key (as in Grench's proposal), although that puts some rather severe constraints on the rest of the layout, but even in that layout, it is not an easy target for both thumbs. It would rather be a reachable but not very easily reachable for either thumb. To make it really an easy target for both thumbs, it would need to be centered and at least QUADRUPLE-width, like on regular keyboards.
Not true. Hold your Pandora with your thumbs on the nubs. Without adjusting your hands, swing them both down/back toward the front edge of the device. Odds are they'll touch dead center over the V and B keys. A centered double-width space bar would be VERY easy target for EITHER thumb.
Unless I'm playing NubNub, I very rarely have both of my thumbs on the nubs. More typically, I have them on the dpad and action buttons when playing games or navigating stuff, or when typing text (which is probably the most relevant use case here), they're above roughly S and K (or between SD and JK). According to my feeling, a single-width space key at the penultimate position is somewhat easier to press with the corresponding thumb than a centered double-width space bar. So while a centered space bar would improve the location a LOT for the left thumb, it's also a bit worse for the right thumb.
Anyway I think we agree that a Pandora-style right-aligned double-width space bar is pointless.
Also I fully agree with Neelix: a dedicated number row is very nice to have, and it would be a step backwards compared to the Pandora if we would lose that.
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I had requested that any feedback not from EvilDragon be placed in the proper topic thread - I even linked to it. _wb_ who is a staff moderator decided to add his negative and misleading feedback about my layout here and I feel it is necessary to defend it.
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So, a center mounted double width space bar -isn't- painful or onerously difficult to reach with either thumb. I'm glad we have that sorted.
For more information or feedback to this layout please use the following thread.
http://boards.openpandora.org/topic/16872-and-now-for-something-completely-different-keyboard-option/page-8
For a quick link to WTF is he talking about, see this:
http://www.keyboard-layout-editor.com/#/layouts/4562af9f8d20cc476f635615e09965bc
So, in defense of my keyboard layout in light of the above negative, dismissive and named comments:
Yes, by having a center mounted double space bar we 'loose' the dedicated top-level row of number keys. Neelix and _wb_ only stated the negative. In this case, though, what we gain is far greater. Please read on to understand why a math & science guy (me) is willing to forego a dedicated numeric row. All of the layouts compromise something. The larger question is, "What do you gain through accepting this compromise?"
We GAIN a functional numeric pad that is nearly as easy to use. Hold down the left Fn key with the left thumb - touch any of the numbers in the pad with the right thumb. Don't consider it to be 2 actions since there is a click-clack rythm to it. Maybe 1.5 for the first number, 1 for the second if they're in a string.
We GAIN the ability to 'lock' the numeric pad AND the Fn pad in the foreground -at the same time-. Press both Fn keys and the Numeric keypad AND the F1-F12 keys (arranged in 3 banks of 4) become the top layer. Think about how many FPS and RPG games there are that rely on having ready access to BOTH sets of these keys.
Oh nooos I need to type a letter and it's Fn-locked to numeric pad and F-key pad! No worries. Press both Fn keys to unlock it OR if you only need 1-2 letters, press one Fn key with one thumb (Un-Fn) and press the related letter. Want a capital letter? Chord Fn and Shift with one thumb and press the related letter.
Chording? What is this black magic? Since the Fn, Ctrl, Alt and Shift keys are represented in a gang on both sides of the keyboard, either thumb can 'chord' by pressing 2 or more of these simultaneously. Examine the layout and let that sink in. It means that ANY key OR alt, ctrl or shift version of ANY key can be accessed by chording with either thumb and pressing the desired symbol with the other.
We GAIN simplicity for real world usage. A simple example of this is Alt+F4. The close window command. On the Pandora this requires a funky death grip to press without fumbling the unit (glad to have the wrist strap on mine). On most of the other layouts presented, it's equally onerous. On my layout the right thumb chords Fn+Alt and the left thumb presses F4. Dead simple.
We GAIN proper use and mapping of the shoulder buttons. The shoulder buttons SHOULD be dedicated mouse buttons 1-4. Keyboard modifiers have no place there. There is no need to have 'part time assignment logic'. No need to remember which shoulder does what under which circumstance. Simple mouse left, right and since it's a gaming device, mouse 3 and mouse 4 so you can have a strafe key and still have alternate fire and grenades in your FPS game.
We GAIN easy access to keyboard modifiers. They do not need to be hidden in the center key set or pawned off to shoulder buttons. They can be actual buttons in their proper placement from a 'normal' keyboard.
We GAIN symmetry and ambidexterity. It -looks- like a familiar keyboard. QWERTY on the top row, space centered on the bottom row. Shift, Ctrl and Alt presented on both sides. Insert and Delete are laid out in conjunction with Home, End, PgUp and PgDn, which should be familiar to anyone. I feel that this layout is as ambidextrous as possible. It favors neither left or right handed users without being a compromise.
We GAIN an intuitive keyboard. When the Pandora came out there were dozens of threads from people not understanding the nub-mouse-click compromise or the keyboard modifiers on the shoulder buttons compromise. Ease of use shouldn't need a manual. New users may actually have an easier time of adapting to this layout than existing Pandora users who have already had to retrain their brain once. This layout looks more like a normal desktop keyboard because it -is- more like a normal desktop keyboard.
We GAIN thumb optimization. The Pyra is not a touch-type with 10 fingers affair. Index fingers go on the shoulder buttons. Middle ring and little finger support the unit from underneath. The surface keys and controls are, 'All about the thumbs'. Thumbs are VERY dexterous and tend to be relatively wide. This design is centered around the idea that a thumb can press multiple keys next to each other at the same time, but there are only 2 of them. They can't press 3 keys in whole different zones at the same time. By using chording modifier keys and a zone-based layout (Fkeys for one thumb, numbers for the other, etc...)
So, to dismiss it because it 'looses' the top row dedicated numeric keys is simply a sweeping negative. It ignores reality and everything that there is to gain. _wb_ has consistently promoted his preferred layout through negative comments and half truths for the alternatives presented. Don't be fooled. There's a lot of good stuff out there. Examine each proposal on it's own merits. They -all- have compromises. The question isn't the compromise, but what do we gain from accepting it?