In the minimal techno piece "animals" by minilogue the main melody varies in notes, that are played or not. It produces an interesting progression in the whole song.
Mutation is easily done in Mulch by a second bassline or finer with southpole. Not like skip. I don't hear if skip is used, but the function must be useful to vary within one snapshot.
1.One idea are scenes of "mute/skip/or let through" and are able to choose. One scene is one pattern with those three values. Somehow the pattern-length for looping must be set.
It must be able to change the progress live.
It is complicated, because those are snapshots in the snapshots, that are more easy to handle with.
2.Another way of doing it is that you are able to delete a whole step and make a new snapshot of the rest.
So very little to change(2) or more of one snapshot(idea1)