Hi Leo,
Sometimes I’m in the situation where playing a song with a guest singer who does not keep up with the beat, either singing ahead or behind beat 1 of a measure. Is it possible if you create the jump buttons so the play head can immediately jump to the next measure or back a measure? This way, I can catch up with the singer whenever he/she missed the beat.
Please excuse my late reply on this one!
This use case might be a bit too niche to warrant adding buttons to AbleSet, but you might find use in this Max for Live device I made a while ago:
Beat Jump.amxd (34.1 KB)
This device allows you to jump back and forward by a given amount of beats or bars. Would that work for your use case?
Wow just stumbled on this post, I was looking for a beatjump for years and haven’t found any 
you should publish it on gumroad / maxforlive.com because many ableton DJs would love this feature ! Thanks @leolabs
Now let’s try AbleSet 
Hey @Hamcat, welcome to the forum!
I’m glad you like the Beat Jump device. I’ve just uploaded it to maxforlive.com here: https://maxforlive.com//library/device.php?id=11223
Let me know if you have any questions or feedback regarding AbleSet! 