Well, I first have to say that you are very brave to write a novel(or novella) using a thumb keyboard. I know the portablility factor is what attracts you to use the Pandora, but I strongly encourage you to use another tool for serious writing. A laptop or desktop are far more productive if you have the recommended software installed. Two that come to mind if you use a Windows based computer are PageFour or, if on a Mac, Scrivener, which is my preference. If you remove the portable allure, you'll discover for real world productivity either are better choices on proper hardware, than what you are using possibly almost exclusively now.
There's no bravery to it - it's very easy, and is much more practical than any other portable device I've ever owned.
I can thumb-type almost as quickly as I can touch-type, and that's pretty damn fast.
Please don't "strongly encourage" useless fluff that just gets in the way, when you know nothing about how I write, or why a Pandora is the only suitable solution for my requirements (really, why would I take a bag or a suitcase to lug a laptop or a desktop around, when I just need to put my Pandora in my pocket? These are not in any way viable alternatives, and never will be, and imagining that they are will simply not make it so - they may be for you, however
). My Pandora *is* a proper, serious tool for serious writing and real-world productivity, because all I need, and all I have ever required, is a text-editor and a keyboard. By virtue of the Pandora using Xfce, I have exactly the same tools at my disposal on my main box as I do on my portable - marvellous!
Or, to put it more succinctly: Don't assume you know better than other people what's best for them, especially not when you're doing so to dodge legitimate gripes with your proposed layout. It's just not a good look...
As for your comment about the gaming controls, if you look closer at the diagram, it should be apparent that they are not surrounded by any of the qwerty keys. The D-pad and Face buttons are located near the edges, like on the Pandora 1, and the nubs are just a tad in from and below them, with a pristine view of the sides and a demure downward glance at the Select and Start buttons. B)
So, the keys that are around the d-pad and face buttons in your diagram are somehow magically not surrounding them? It doesn't matter that some of the edges aren't surrounded - some of them are, and you know full well that that's what I meant.
EDIT: Now you point out the Select and Start buttons, though, you might want to consider putting them closer together - since so many systems that are emulated on the Pandora did that, it would definitely be beneficial for any follow-up device to continue following suit. It does have an impact.