never once in my ten years did I see an arrow pointing off the map....
and say to myself...
"OMG what the ^%$# that guy has ruined my #^&$%# game...this is bullcrap no one should be allowed to go off the map....if he goes off the map...then someone else will go off the map....and if they go off the map...then everyone will go off the map...... it will be anarchy.....I must put a stop to this kind of blatantly rude behavior"
get a grip.
If you're worried at all about defending against strat runners on some maps, it's a concern. It's basically near-invisibility and more unpredictability than is available any other way, often giving them a nearly free shot at a strat for no risk.
A solution I think would be nice would be off map, instead of the arrow you show on enemy dot dar. Takes away the advantage, not sure how difficult it would be to coad.
The 'engine goes off when you go off the map' idea sounds good, but I bet someone so inclined could glide a helluva long ways dead stick in a bomber from high enough to still abuse it.
Turn em back, glass wall, blow em up, dot dar... Something along those lines I'd be good with.
Wiley.