FRCS = Forgotten Realms Campaign Setting
Persistant Spell is in there, too. Also in Tome & Blood I think.
About archers and the need to move around... that's only the case, if there are not enough meleers around to keep the opposition busy!
It makes sense for an archer to sacrifice defense for offense, which is why archers usually deal a lot of damage, but are easier to take down in melee, but it doesn't have to be like this.
And with quickened Spectral Stag (spell from Magic of Faerûn, similar to Phantom Steed) a cleric is highly maneuverable while retaining full attack ability!
Did you consider a Ranger or Ranger/Deepwood Sniper?
Bye
Thanee