Dude.. this happens anyway but if 3rd class buffs are retail like ppl who cant box have disadvantege.
We are talking about cov/prophecies/siren/rene/champ right? (anything else?)
For archers.. u need oly cov.. so u box WC and cat - 2 boxes.. sux
For mage u have to box BD and sws - again 2 boxes (3 if u want pony)
So ppl have to run around with 2 boxes all the time to be competitive in pvp.
Really dude.. if u are looking for playable support classes.. low rate server is the way to go.
Buffs with short duration doesnt change dmg... what would do is removing those buffs from the game but im not sure if ppl would like it.