Hi Ikaria ,
what about enabling all Item Setskills to all players inside battleground, that you can also use all ISS for it?
I guess would be nice to have some ISS to use. In that case at least warlock shield (dmg mitigation) and priest shield (dmg mitigation) need to be adjusted for pvp (adjustment to skills are already in planning I guess, assuming planned patch notes?).
Would be more work, but I think some ISS (even in weakened form) would make fights more dynamic (even though pvp is still not sooo attractive to most players :D)