No, just play the class better.
Only if you were around during the time when I played my High Priest, Anael, you'd possibly see that High Priests can indeed fight well as they are.
Buffs are fine, players make 2nd clients and buff themselves before any battle anyways with every buff RO has, so this would only give them more power, making them more of a challenge.
And no need for a magical offensive Holy Bolts.
If anything, Archbishops are going to have something similar to that anyways.
Although this server won't have Archbishops or 3rd classes for 2 years after they come out in official/other private servers.
Consider Turn Undead like Sense, it's useless in PvP but useful against monsters. No real purpose to being there, but so are many other skills.