I was about to report it as a bug, but decided to do a quick search. OK understand, and I do re-enable TX most times after I send RR73, especially as that also resends RR73 if your QSO partner repeats the Rxx message. I's just I sometimes forget and then it's a nuisance.
Maybe the settings button for this should be disabled if "Call 1st" is set. -- 73 Phil GM3ZZA