Thanks for the feedback. Some of what you are looking for is already there. You are able to export any of the system defined lists including Do Not Mail, Removed and Active. Here is a sample encoded form for the Active resource:
I will look into this as a possible enhancement to the bulk activity though. In the UI, you have the ability to merge lists into another one which can then be exported. This functionality would end up providing you with the ability to export multiple lists in a fashion. Thanks again for the feedback!
Dave Berard Senior Product Manager, Constant Contact