At some point I believe BLM should be given a spell steal and/or mirror image ability. The spell steal would be able to take enemy/boss buffs (those that aren't mechanic based, i.e.) you'd be able to steal damage up buffs or even the enfire/enthunder/etc buffs.
The mirror image skill would create a clone of your BLM for a few seconds, possibly six seconds, no more than eight. Your clone casts the same skill that you are currently casting. You'd be able to Swift Cast > Flare and have it hit twice.
I would be surprised if BLM doesn't get any skills like this.