I know I already mentioned this in another thread, but I'd really like to see some quick way of paging the display. Your idea of using finger-touch to pan is nice (presuming Fremantle/N900's finger detection is more reliable than Diablo/N810's), but especially with a smaller physical screen on the N900, paging would be useful; when zoomed in to the point where the average person can write neatly, manually scrolling/panning with stylus or finger is cumbersome. I'm throwing this out again to see if anyone else agrees, but if it's not something you want to do, I'll understand.
Thanks for the colour palette buttons, though - that was my other main quibble. I look forward to the new release, and I'll definitely test out the future Diablo version in lecture.