Here's a method that will work with any drum sampler or soft synth.
First, separate the instruments into their own MIDI tracks, e.g. kick, snare, toms, overheads and room.
Clone the tracks you want to double, and check the "Link to Original Clip" option. This will make sure that any edits you make to the original track will be duplicated in the cloned track (they're actually one set of MIDI events).
Be careful choosing which sounds you layer, and try to use very different-sounding samples, and EQ them differently. Two drum samples with similar tone may come out sounding very thin.
Don't ignore any cheesy drum samples that you might not normally use, as they might be just the thing to complement another sample. Session Drummer, TTS-1, Dim Pro, event Z3ta+ and Pentagon are potential sources. (Try this: double the kick in AD with the kick from the TTS-1 standard kit. Take off the high frequencies from the TTS-1 sample so it's all low-frequency whump.)