So I had a thought today, "Would mecanum wheels work in KSP?" The answer is:
Yes. They do, in fact, work.
For those wondering what mecanum wheels are, they are wheels that allow lateral (sideways) movement. They are wheels that are made with smaller wheels/rollers around their circumference of them, canted at a 45 degree angle from their center axis.
I made a short video demonstrating a drivetrain in KSP using them: https://www.youtube.com/watch?v=UbCuh1aUn1o&
I'm not entirely sure what applications you could use this for in KSP, but it is interesting that they work in the game, and I thought I would share that.
Have fun!