In response to the OP request, while I’m new to the Aeros, I’ve been looping in live situations for several years. In the few days I’ve spent adapting to the Aeros workflow, I’ve found the UNDO to be very useful in this fashion.
Example, I’ve laid down the rhythm, bass, and chords for Superstition, I can play the “horn” part… let it loop a couple times while I solo over that part, and then press and hold that Rec/Play/Over button and it “undoes” that extra lick.
Maybe a “play once” would be useful if you’re pre-recording your tracks (I always build mine on the fly and trash at the end of every song), but in that case, just build a separate “song part” and you can easily select and queue up the return to the first song part and it will automatically do that when it reaches the end of the bar.