Here are two simple KM commands — go to bar (or rehearsal) and play immediately.
The rationale: When composing, I often go to bars or rehearsal numbers and nearly always want to play from that spot. As far as I know, there is no native command that enables me to do that immediately. The following may seem trivial — they save exactly one keystroke — but they help a tiny bit with my flow, and that’s always a good thing.
I’ve assigned the KMs to:
ctrl-cmd-G Play bar immediately
ctrl-opt-cmd-G Play rehearsal immediately
… but obviously, you can change to them to whatever you like.