|Well, if Disney knew who Moody is, mabye she could've been in the movie.|
And they would have been sued, most likely.
Disney takes advice from nobody because they'd prefer to keep their funds intact.
Anyway, Crossfire... that's a pretty different idea, since Angel's popularity mostly hinges on her lack of substance - therefore people who aren't immediately inclined against her see her as whatever character they will and end up liking her. So there's a chance that filling her out would put off some of the established fans (and we know Disney doesn't care a fig for their long-time fanbases).
Angel and Lilo already seem to be friends though... for some (coughPLOTHOLEcough) reason Lilo dropped her massive grudges when Angel turned good. She now has no objection to Stitch spending more time with Angel than her, apparently...
I don't think the idea would work if it was series-based, but I've always quite liked the idea of all experiments lending their powers for the greater good of the galaxy.