I believe that there are a few marginally useful spellweaving spells for PvP, but nothing that you don't have something more useful/powerful with other skills. For example, essence of wind is a good area effect spell, but wither is so much more powerful.
Gift of renewal can keep you alive in quite a few PvP situations (especially one on one), for a while, but after it runs out, then you have to wait before casting it again. Again, the skills are better used in other areas.
Consecrate or curse weapon are better than immolate weapon (all kinds of damage vs. only fire damage)
So while spellweaving is great for PvM, your PvP skill points are better used elsewhere.