Customization Suggestion: Mismatched Wheels
this is just one example I made in image editing. But various patterns should be available. AND FOR THE SAKE OF GOODNESS and "good PR", DO NOT implement it as distinct premium wheel sets that are fixed colors/patterns -- it's very obvious this implementation is just artificially inflating the premium items into the store for profit.. Instead have it be a feature where you can select 1-4 wheels and select a pattern
Patterns:
crisscross - like in the image above
Rail - two different wheels parallel with the rail of the board. a pair of wheels on each rail
Truck - two different wheels parrallel with the trucks. a pair of wheels on each truck.
4 combo - select 4 different wheels
BETTER IMPLEMENTATION:
Make it not a pattern feature and instead have it completely customizable which axle gets what wheel. It will look like 4 slots on the GUI, and you can select the same wheel more than once.. this means you can technically just set all the wheels as the same one which makes using this feature redundant or have 1 wheel out of place out of 3 wheel copies -- basically allowing you to do any pattern you want, even with an odd number of different wheels.
This adds additional depth to customization and that's why it should be added.
Additional suggestion (gameplay)
Also don't forget about adding wheel hardness back to skate. At medium speeds I only get two reverts before I'm stopped dead. I also think it's a game-physics issue where manual-reverts have the same friction as normal reverts when they really shouldn't -- friction should at least be halved -- but really should be reduced to a fraction since being on two wheels is far more maneuverable for spinning. It's more akin to a pivot than a high friction revert. IRL though it can vary for sure, sometimes the sound of the pivot will be loud, but at slow speeds you'll probably not lose any speed. I guess there should be a feature where under a certain rolling speed, the speed loss effect from manual-reverts is very very faint.