heres some threads to read for you, im not sure if the glue on helis has been 100% confirmed as possible but i dont think there should be any mayor problems with it, only the blades could maybe get a big dangerous but that should be easy to fix, you might find the answer in one of these topics tho, glue on cars has been confirmed as possible and the team might even release some sample code for it
http://forum.mtavc.com/viewtopic.php?t= ... sc&start=0
http://forum.mtavc.com/viewtopic.php?t=10083&start=0
http://forum.mtavc.com/viewtopic.php?t=4804&start=0