+1 but for an easier way to do it. There are work around available but they are not intuitive or easy.
Band-in-a-Box has "Natural Arrangement" and "Simple Arrangement" checkbox options in the "Song Settings" window available through the "Song Settings" button in the song title bar just above the song tempo.
Pressing the "Bar Setting" button opens the "Bar Setting" window that allows you to clear the existing RealDrum track, substitute a RealDrum track or swap midi drum kits if using midi drums.
Have you tried freezing the other tracks and using any of these settings to change the drum arrangement?
Most of the dedicated drum track creation tools I have looked at have a method to simplify or embellish a drum track. I like, but don't have,
+++ RealiDrums +++. Realidrums is a drum track creation tool that works as an instrument inside both the free Kontakt Player and full version Kontakt. It has sliders to individually adjust complexity of each drum instrument. It also will automatically play a 1, 2, 3 or 4 beat fill as desired. It will also export the drum track output as midi for additional editing or playback in a DAW as well as accept midi input from a DAW for use as a midi sound module. It is also presently has a sale price of $99.
All drum track creation tools I've seen create midi drum patterns and have a playback sound engine to playback the created midi drum patterns. That type of dedicated, integrated, modular system is designed for flexibility. A tool like EZDrums can also be expensive, especially if you start purchasing expansion packs.