A wonderful job with the current ROM.
In general, I would favor in the next release any improvements that improve application load-time, and this is particularly important for the PIM apps like KA/Pi, KO/Pi, etc. In terms of the filesystem, I would opt for one that has worse compression but is faster.
On a related note, I notice that the Zaurus' display system is not as fast as [much simpler] Palms'. Ie, menus are slower, switching tabs in Qtopia you can see the screen redraw, etc. If this can be improved upon, great! If there's any discussion on this that anyone knows about, please provide me the link!
Best, Sriram