Awwww, this is a class after my own heart. Superb work. With your permission, I'll put it on the front page.

Please correct me on this if I am in error, but could the Minionmancer summon, say, 4 hasted hellhounds (2 from the twinned Companion ability, 2 from the Alteration) with one standard action? Because if so, cue evil grin.