Apparently multiply 'casting' is a one-off hack and only exists because there wasn't a good way to cancel the multiply if the piece had nowhere to move to. 'cast' style powers seem unfavorable.
Which is a shame because the gameplay ramifications seemed really fun and interesting, especially for cluster-busting. If you have a requirement that the piece has to have move diag to multiply diagonally, you remove the element of surprise from a diagiply, the unexpected nature of it is what I was looking forward to.
Earlier today we talked about powers that would be really cool as radial-casts (hotspot [though I think this is really powerful, maybe too strong], power plant (would be nice not to need to move for it to be useful), raise\lower tile (which would be the much heralded 'terraform' power, radial castable, select between dredge, lower, raise, and wall, and still only affects one tile) and bunker (with a radial castable t2 bunker as an inverse bunker, where the piece can't get out unless the bunker is refurbed). But from the sound of it, no dice on any new cast-style powers.
Back to learnin' actionscript I guess.