I do think for taking all that time to get that title it should come it more benefits rather than just showing it off. It would be anet showing appreciation for the time you took to achieve the title anyway.
This is a redundant argument. GWAMM IS a reward. The reason people grind out a bunch of titles is to earn GWAMM. If you don't think five words under your name is worth the effort, then don't get it. By earning GWAMM, you know precisely what you're going to get, so don't get it and then decide it's not good enough for you. A reward for a reward makes no sense.
Regarding the topic, it would be nice if it auto-selected (i.e, a convenience not related to GWAMM) but honestly if you only realise you've forgotten it halfway through that's a pretty good sign you didn't really need it in the first place.
Press H. . . Click on title you want . . . Press H again . . . 3 clicks. Don't be so lazy just to change your title, its alright if you want to show off you GWAMM. It's not like anyone can see your GWAMM in an explorable area anyway.