I believe the keymat material is also conductive - I'm not sure whether the above mentioned 3d printable flexible compound is or not.
Everyone thinks they can do a 'better design'. That is a major reason why the keyboard threads were so lengthy. What we have, though, is VERY good. You/someone may or may not agree with that statement. However, everything on it - and where it is on it - was thought out and fought out in excruciating detail. What you/someone might see as a flaw will most likely have a very direct and intended use/effect/capability. It is also a balance between function, aesthetics, multilingual capabilities, gaming and office-type uses.
If you want to gripe about it, open up a thread specifically to, "Keyboard Gripes and Explanations" in /General and we can all go through it again. Just keep in mind that at this point the only way there could/would be any changes to the production keymat is if someone can find a catastrophic flaw in the current one - which has been thoroughly vetted already in the prior process.
There are/were reasons for everything on the current layout. The end result is from a long and boisterous collaboration and debate. In the end it is much better for more people than any of us came up with independently.
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Since I am happy with the standard layout, I can't judge my own opinion, but would a key plate, like on some office phones that say what the key actually does, be an acceptable solution?
IMHO, all of the keys are labeled very well EXCEPT right/left click mouse which uses the nub-presses reversed left/right to normal mouse buttons. Sounds confusing, but it makes perfect sense if you give it proper thought.
What did you have in mind that would/should be printed on this key plate?