My only suggestions are sure to have been already overheard:
1) Color choices. LeMans Blue Metallic is a color that should be a cost-option (among others). This may slow down the production line, but if the color premium is enough to make it happen....?? May not be worth the trouble to re-tool the production line, but I can dream.
2) Stripes!!! All varieties, flavors, and colors. Underneath the clear-coat, please. If not from the line, at least MAKE SURE that the GM-Accy division has a line on "approved" paint shops that can make them happen, and still be considered "stock." I ask this mainly for provenance.
3) Performance drivetrain options. This is ambiguous, as we can't ask for what may or may not already be in the works. But consider this: even if it's offered after the THIRD year production-run, considering sales factors have been met --- offer us some options --- such as: A short-throw shifter. A dual-stage clutch. Different ratios for gears. Exhaust options (dual-stage butterflies, as with the Z06).
Yup, I know, too much to ask. As I've said before, as long as it comes with a 400+ hp V8, the rest is just gravy!