I believe the quick synergy developer recently posted instructions on getting a cursor to appear on Maemo Garage News. I think his instructions require you to run a script and then reboot for the cursor to appear.

I too would like to be able to use a BT mouse with my N800. It would be great help for using the N800 for RD/VNC purposes and the odd game of Quake 2. It may not be high on their priority list, but it seems like it would be trivial to add as a "completely unsupported, don't call us" feature.

On the other hand, adding A2DP support is likely non-trivial, but is extremely high on my wish list of features.