If they could add the possibility of making all wheels available for all (Premium) cars, where it applies ofcourse, in a next update I'm already satisfied.
Not only are the limited options for a lot of cars, well, limited but also often poorly chosen in my opinion.
If some cars for whatever reason aren't going to have all wheels available then at least make a selection which is rather obvious, logical or appropriate.
Some classics (for example the Fiat 500) can only be fitted with modern wheels whilst there are those American Racing 'Vintage Torq Thrust' alloys which perhaps aren't ideal but more suitable than a selection of modern wheels.
A lot of modern cars also have a poorly selected stash of alloys, and even some wheels on themselves are questionable on any car (especially some designed by PD) in my opinion which since there aren't that many in the first place is a real shame.