Can we be realistic for once and realise that there simply isn't 15 trillion amazing meleers who play in arty/cav/rifle regiments? There are very, very few and the ones that do are usually already part of a competitive regiment.
And the idea that we out right ban double regging because some people are scared of regiments using these imaginary good players, just bans a bunch of legit players like voluble whom you "don't mind".