I know it would never happen, and its been sort of done before, but gun stations. I'm thinking a whole turbo-laser battery, or atleast a single gun, like the ones seen on the first Death Star firing at Luke 'n Friends. I just think it would be a cool way to tie a bunch of the Imperial figures together. Again, never going to happen, but I think it would be a cool piece for display (especially since it seems that so much of the Rebel firepower is in snub-fighters, so logically their counterpart would atleast partly be Imperial gunner crews...).