Snarlygribbly's Scenefixer will turn off all ambient material on all zones on a figure or prop so that they won't emit light.

As for the light emitter checkbox, I don't know of any script so far that will do it all in one shot yet...and if you want that thing (even if it's not emitting light) to bounce light you'll need to leave "Light Emitter" checked on. The only thing I uncheck that for is for hair since Firefly has such problems with transparent layers.

Laurie