I'm not too sure about the GAC youtube account, though it would be nice for adventure trailers. We have to realize that most of the youtube community isn't really interested, or even PLAY spore for that matter. Plus, It would probably attract the type of user we don't need in this community, but if all you guys want to do it. I have no problem with it whatsoever.
Also, the profile idea is also doable, but I think that should be the choice of the GAC team members.
Still, mighty fine ideas you have there, bence.