easier to use chord track for composers

I love the idea of using the chord track to help me re-harmonize a cadence in a piece of music. I keep getting stuck with the way that it works presently. It’s ultimately easier for me just to make some note changes with all midi events selected in the key editor.
If I could just put in 3 chords and play with the chord assistant to make a cadence with the middle chord this would help me a great deal but I wish the chord track had an option similar to the marker track where whatever chord you have in the chord track it would have a “term” or fixed duration so it would not affect everything on the tracks after the bar or 2 beats that I want to use it for. Having handles on each end of the chord.