Well, since Aaron is my best friend, I think I can answer some of these question for you. (Aaron, correct me if I am wrong please)
He doesn't wear his hair up like that every day. It is too much of a pain to do on a daily basis (what does it take, like an hour at least to do that?). As far as I know, Aaron only puts his hair up for "special occasions", such as competitions and GWR photo shoots.
As for doorways and such... Aaron is pretty short so I don't think it's a huge problem (sorry Aaron... but yea.. you are shorter than me
). Plus, his mohawk is pretty bendy... you should see it when the wind blows. It flops right over and springs back up again.
And, if you are curious as to what he uses to put his hair up... its not Elmer's glue or anything of the sort. He uses hairspray, and alot of it.
Hope that answers your questions, and if I got anything wrong Aaron... well you can beat me up next time you see me.