The reason for the rule (about "not putting a new line for a part marker followed by another part marker within 2 bars") is that this would be a 2 bar "section", and it is considered that 2 bars is too small to be a separate section of a song.

I could add a combo in the F5 dialog
Line Break for this bar
Auto (< ------------ default)
"Force new line"
"No new line"


Have Fun!
Peter Gannon
PG Music Inc.