Rear one, I has a good idea, everyone the Guild Wars knows, points something from a Gildmenu. Thus there should be this function also with LFS, i.e. if someone wants into a team can the Leader simply one inquires to the person to send and if it accept press, which he gets the Skin/s of the team

Most teams take on members a bit more seriously than that.

However, for organising temporary racing "groups" when on a random server, that sounds like it could be fun.

Eh? Can't you just race together, and use MSN/email to send skins?

I dont think the devs are responsible for the organization of teams. Thus not needed.
Ok, public skin download from lfsworld would be nice, but I dont know if it's a good idea traffic-wise.