1351 mouse is already supported:
Yes, I quite agree about sometimes a simpler solutions is better, provided it is good enough. Falk is busy working on the MEGA65 (and C65) versions of GEOS, which should be very nice to use, with increased screen resolution, MUCH faster drawing, and of course able to us the extra RAM and SD card storage.
As for LCD panels, we are also well down the track of adding support for naked LCD panels. However, unlike on a C128, you don't need two monitors, as 80 column and 40 column drive the same display output. We don't currently have plans to allow different display on separate outputs, although there is no fundamental reason why we could not have something in the future.