SRD Variant Classes said:Rapid Summoning (Ex)
Any time a conjurer using this variant casts a summon monster spell, its casting time is 1 standard action rather than 1 full round. (Creatures so summoned can only take a standard action in the round they are summoned.) Conjurers using this variant gain the normal benefits from enhancing a summon monster spell with the Quicken Spell feat.
A conjurer using this variant permanently gives up the ability to obtain a familiar.
I was thinking, since we already have a necromancy variant approved, I'd suggest one for Conjurors since I was planning on creating one in the near future. Trouvere mentioned it having it's own balancing factor built in, and I think I'd agree with him on that, whether that was an 'official' opinion or not.