Currently the EV regen mode switching is verry tedious; it requires you to use the UI. This isnt necessarily a bad thing, however, when trying to be immiresed this can quickly get you out of it. A common occurence in BeamNG is that the UI doesnt show the radial wheel, this can make it somtimes that you cant even switch regen mode. My main point here being, that there should be a hotkey, even if its just for redundancy. An extra argument to support this is the already plentufull amounts of options under the vehicles, like 4wd, diff lock and nitrous, so whats 2 extra for regen mode up and down?