You’re talking about rapid fire, right? Holding space bar in Xenon 2 kinda does that, but much too slowly, so there’s definitely a need for that.
Weird thing is, in theory, it should be possible to address another combo, as it’s a widget like any other. But I just tried, and nothing happens, so maybe there’s some quirk to it. ? I’ll try some other things, I could swear there’s some kind of auto repeat.