Agreed.
RB should stop when either the last MIDI Event happens (if no audio) or when the last audio track finishes playing the audio.

Glad that little trick worked for you. There must have been some extraneous data farther down the line or an audio track never sent the End Of File message (or something like that).
Cut-Close Gap has always worked here.

Make your sound your own!
.. I do not work here, but the benefits are still awesome