Super Easy Drum Editing:
You can easily edit the drum track how you like as every section will contain the whole drum track, you can select whatever shot, hold or push you want and adjust it's vol level or timing/position or put any fill anywhere, you can use A/B Endings anywhere in the song. You can copy the hits from the end of the track and add them wherever you like, let them bleed, adjust vol level as you don't have a consolidated rendered wav file.
It can the be instantly made into stems once you get it how you like without rendering and dragging a whole lot of stems, the only issue being is when they made the stems they did not add the shots, holds and pushes that are at the end of the stereo file, as you can see below in the pic, so you will need to copy them to the stem track from the stereo track wherever you have a hold etc... hopefully there will be an update to fix these.

Watch https://www.dropbox.com/s/rj3xsgdacivjjis/Reaper-Biab-Track-Injector-05.mp4?dl=0

Download Reaper-Biab-Track-Injector-05.mp4

Turn Auto Crossfade Off to allow bleed