All of the things you mentioned are possible. Quick Brang is quite doable. What you do is make an item script and an FFC script. The item script only "activates" the FFC. In the case of Quick Brang, you'd have six or so FFCs dedicated to the task. You'd keep the last fired Brang in a global variable, then load up the next FFC whenever the player fires. When activated, the FFC would move to the players location, move in a set pattern (out and back) and then go back into storage at -16,-16 or as an invisible FFC.

Like I said, the only trick is to get the enemies to react properly to being hit by the FFC. That's the only piece I'm still working on.

Oh, and as for crash bombs - yes, that's doable. It would be TONS simplier if we could spawn lit bombs. As is, it will require at least 14 FFCs to function properly.