1. Make it wireless - i think this is a must.
2. I like the idea of using my space explorer outside of solidworks. I see the lastest driver allows this. I would really like it if you could dynamically zoom the screen. This would be very similar to the magnify tool built into windows 7 (i cant get the space explorer to work with that though..). You could zoom your view by push/pull and pan the screen by updown left right etc or potentially have an option to zoom to your curser. The reason I want this....for my HTPC! HTPC are increasingly popular, so perhaps you could design a space mouse specific to the HTPC market. It should be wireless and would be great to use in the likes of XMC and also when sat far away from a normal TV and trying to look at webpages, spotify etc.