Just wanted to throw out that you can, in fact, create any combination of primary and secondary powersets for any rank of npc in AE. I have a species in one arc that is based on melee primaries and buffing secondaries (another server has a "guardian" AT like this, if I remember correctly). You can also edit the data files to further customize your AE characters if you like. I do this on most of my named bosses to give them more flavor, though that disables the experience earned on those characters, if that is important to you.
As for the OP, as many others have said, there's not a place for this on Homecoming as it would completely imbalance the game as it is. I'm not saying it wouldn't be hella fun to drop Tar Patch and Whirlpool, then Freezing Rain, Blizzard, Rain of Fire, Ice Storm, Storm Cell, Hurricane, then Fold Space for days, but it's out of scope for what the HC team has stated as their mission statement. It sounds like there's already a solution for people who want this.