It would be great to have, for example, a special Playback Buttons group, pool or section, whatever you want to call it, where each playback excludes the others by default.
For instance, I could select a group of 20 playback buttons and check an option which prevents more than one of them to be active at the same time, so each time I launch one automatically releases the others.
This would be a very efficient way to keep a clean playback behavior, without having to release manually, via macros or excessive programming or individual configuration to achieve this simple thing.