Would it be possible to add hits in the microchords? I was doing a song at 80 BPM this morning and thinking how nice it would be to be able to do a measure with hits on 1 + 2 + 3 with drum fill on 4.

If by Hits you mean what PG Music calls a Shot it is possible now.

Enter M on the chord sheet to open the Microchords dialog window.

Select the Chord Options button. This opens the Chord Options dialog window

Select the Rest Type drop down menu

Select Shot