1) A compass. I really miss having some idea which way I'm going when out joyriding on back country roads.

2) Indicator of what gear I'm in (there's a space for it on the dash, but it seems to be active only on the auto-stick apparently. Not usable to double-check whether I'm in 1st, 3rd, or 5th gear before letting out the clutch).

3) Cruise control on/off indicator.

4) Two more inches of cabin space to recline and/or move/adjust the seat (I know ... outside of the 'scope' of the thread).

5) one-touch top retraction. Holding the button for the whole process keeps my hands occupied when I should be using those 22 seconds for putting on seatbelt and sunglasses so I can get rolling.

Mentioned before, but these are the only ones that really would make the car perfect:

6) Intermittent wipers (more than just one speed).

7) A usable cupholder (or ... maybe two, even?) - safely away from my elbow.