I think getting the PIM stuff completely bullet proof on the SL-Cxxx range so that it doesn't pop up at 320x240 in the middle of the screen when you wake up the Z with the application buttons would be one of the things that I would be looking for.
I would like to make the switch and contribute... contributions may be a little sporadic though and don't want to have to fix that one first.... I'm sure it's not a trivial issue because it's been hanging around quite a while.
<update>Doh!, sorry should have read the first part of this message, well parhaps someone else that has an idea on the part of OPIE that may fix this issue is listening</update>
- Andy