Nymaz

But I want everything, with whipped cream and cherries on top...

Seriously, though, thanks for all the info! It does give me a lot to think about.

Regarding the last question you answered, I'm the player he mentioned, and my actual question was regarding applying limitations to a single slot in the multipower.

So lets say our hero GenericMan has a Multipower with a 60 point reserve, and EB, FF, and Flight all in the pool as standard (non fixed/ultra). His FF and Flight are pretty boring, but I want to throw on a few tweaks to the EB, say Double Knockback and Personal Immunity for a total advantage of +1. This would make the EB's active cost be 10/d6 or a maximum of 6d6 if all points in the Multi are put into the EB. Now I want to throw a more powerful EB than that, so I give the power an Activation Roll of 11-, making it quite unreliable, but more powerful when it does hit. Logically I'd think that if an advantage would raise the Active Cost, a limitation would lower the AC, and thus I could throw a 12d6 EB from that multipower. But from the way HeroDesigner works, and from your reply (copied below), it seems that it doesn't. I guess then my question is what is the point of applying a limitation to a single slot in a multipower? It seems that it wouldn't be to any "advantage" for me to do so.

HERO DESIGNER is applying the rules properly. The size of the Multipower reserve (50 points in this case) limits the Active Points you can have in any one slot. Thus, if you want a +1/4 Advantage (e.g., 1/2 END), the base Power can't have more than 40 points (because 40 x (1+1/4) = 50). Taking Limitations on the slots helps to reduce their cost to the character, but doesn't let him use more than one at a time.