Tweaker

It may help to just add an example or two under the powergaming rule so there's something to point to when someone follows you up a mountain on a street bike or whatever.

I like the idea in theory but it would be very difficult to execute since not everyone can play every day, time zone issues, etc.

I don't see the issue. It doesn't affect me at all if someone wants to say their Buffalo is a Mustang or their Bagger is some sort of Harley. Obviously that person shouldn't be pointing at your Buffalo and insisting it's a Mustang but I haven't seen anyone doing that personally. Any confusion can easily be cleared up with a simple line of text.