Fuse Brood feat for Broodmaster Summoner

[Anarchy_Kanya]

What's your opinion on a feat that would allow the Broodmaster to fuse his Eidolons? The two small ones into a medium one, or if you take the Large/Huge evolution, two mediums into a large, two larges into a huge. The fused Eidolon would simply combine all the statistics and evolutions of the two Eidolons it was fused from. It would take like a full-round action to do it per fusion. Lasts until you dismiss it as a full-round.
Would that be too strong for a feat?

[Senko]

Hard to say on the one hand the whole point of a broodmaster is having lots of weaker Eidolons so its sort of negating the classes special feature in favour of indefinately functioning as a normal summoner. On the other hand at level up you can decide what combination you want from the improved brood series of upgrades e.g. 2 medium becomes 4 medium or 8 small or 2 large or a large, a medium and 2 small (feats allowing).