Scott, guess I was just thinking of right clicking somewhere in the rectangular area that will be downloaded, to bring up a list of options. But now that I think of it, naw....
Perhaps one useful option in the message box that pops up might be 'download all active tile types' if type is the right word. Say I wanted all the topos. While viewing topos, just select the 'active current types' option, and I could get them all for a very large area, nothing else. Then maybe I would want the aerials. Same process.