Is there a way to indicate Tacet over empty measures or, preferably, over a multirest section in a part where the instrument is not playing? For example, the piano is not playing in sections A and A1 and starts playing in the Bridge.
If the piano frequently has long rests, one solution might be to edit the piano’s instrument definition so that it’s not a “rhythm section instrument.”
Then you’ll need to manually create chord symbol regions for those places where you do want them in the piano part, but you’ll automatically get proper multi measure rests.
If there aren’t many long rests, instead try hiding the chord symbols in the piano part and see if that allows the multi measure rest to appear in the part.
Well, the only way for the chord symbols to show is to keep individual measures of rests (after all, tacet is simply “rests-on-steroids” — i.e., resting for an entire movement, song, etc.).
So it seems that you’ll adjust things as per Ben’s suggestion to get the generic bar rests throughout.