I don't know if this is just me or not but when I change vehicle by control E the control E is unresponsive you have to press it like five times before it responds and opens the vehicle menu
You shouldn't be pressing it "like 5 times". The problem is that it's very slow to open right now, and can take a good 10 seconds to open after the first press. It is very annoying, so it would be nice for it to open more quickly and be more responsive when pressing the back arrow from a vehicle's configurations.
Depending on how many mods you have, it could get even worse. I have the stock vehicles and about half a gig of mods and it takes 6-7 seconds for me. I'm on a HDD. But it does open on the first press.