Beamshapers work, but adjustable (i.e. defocusing, like Mag, etc,...always seems to stink and have a big donut hole).
Maxabeam has a nice solution, with their partial diffusion filter, you get a decent spot, and then with defocusing, you get a perfect flood (but again, the in-between has a donut hole). I may have to try this with a Mag, since it has a relatively tight focus.
Changing focal lengths will still give you a spot, just a little more or less sidespill. Now, the way to really do it, would be for the reflector to change from smooth to orange peel /ubbthreads/images/graemlins/grin.gif