Hi Matt,
Actually, you can copy many bars of rests, holds, shots, etc. (many-to-many) with the copy rests dialog.

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Example: I have at bar 2, 3, 4 |A..G / / /|Bm.../ / /|D.B / / /|

Copy rests dialog:

Copy rest from Bar # = 2

Num Bars to Copy = 3

Copy to Bar = 38

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The result is that the shot, hold, and rest was copied to bar 33, 34, and 35 respectfully.

I did this on both a 3 chorus and single (unfolded) chorus.

One caveat: There must be chords on the target bars (bars without chords won't of course see any change; target bars with chords realize the copy result.

Granted, the Copy Rests dialog doesn't let you do non-linear (i.e., non-sequential)or nested copies or lists of bars (e.g, copy the ranges (bars) 10-12, 14,15, 16, to non-linear targets), but at least you can do multiple sequential bars to a target of the same rests, holds, shots. Now if the PG team wanted to incorporate nested copies that would be nice, but not sure how many would use that feature.