Glitch fixes should be in a free patch, they're fixing a defect. Charging to fix them would be pretty lame, I wouldn't expect
that from R*.
A race editor, host your own custom tracks in the on-line races.
I miss the flame thrower.
A chopshop.
Bring back Ambulance/Firetruck/Police/Taxi missions.
Add repo side missions. Complete initial 10 repos similar to GTA4 exports & tow trucks show in convenient spots.
A buyable warehouse to store your personal car collection.
More missions.
Map additions.