Could you use Siphon Might as a pre-buff by targeting yourself, a willing ally or a mount?
I have a dex based character that has no real need for strength and the ability to cast Siphon Might at 10th level. Could I voluntarily fail the saving throw and give the party's melee powerhouse a strength boost of 6 to 11 before kicking down the door to the BBEG? Could I convince my animal companion to voluntarily fail his will save and use an Empowered Siphon Might to transfer a strength boost of 9 to 15? Could I use the spell on my mount? It would be worth bringing some sort of large noncombat pet along just for the periodic strength boosts.
Possible, I suppose... but keep in mind the bonus the other creature gets is an Enhancement bonus, which doesn't stack with belts granting the same bonus... so it's a bit less useful than one might normally assume.