You have never got pvp xp from kills, there are achievements

Bare in mind if you made any buff to the paladin's ability to permanently allow a healer to cast, it would be beyond overpowered in wolves den

You cant balance things around a mode that caters to the lowest common denominator, just because bad healers dont understand what positioning is or how to tank effectively doesnt mean you should be outright buffing tanks to allow them to cast constantly