I'd amend the suggestion.
I use "Mark" when a pileup operator is not IDing, and I want to return later to see if I can get the callsign.
For that, it would be good if the Ctrl-Alt-Up/Down Arrow keyboard shortcuts would stop at Marks in the bandmap. (It presently just stops at new multipliers.)
I have sometime flagged such pileups with DX1, DX2, etc., but that's a kludge...