I know I would like to see:

1. Beefed up Front A-Arms
2. Bleeder shock caps on the shocks
3. The Plastic chassis included by default on the "Factory Team" kits since that is the common changed part
4. Quick Change rear setup on the T4
5. A slot on the chassis down the battery holder center that you can add in weight as needed for lipo packs or to biase the weight by not use to the battery to do it. Could be intergrated into the chassis somehow.

Thats about it I can see for now. Really not much, but with anything, you probably can improve it.

Joey: check your pm.