Using and mastering keyboard shortcuts is one of the best ways to save time and prevent RSI.
When logging actual time on a task I’m going to a new line when I hit enter.
If I want to log the time without touching my mouse I need to hit [tab] five times and then [enter]
As ctrl + enter is the default for submitting a message, I think it would be logical to use this as a shortcut to save logged time. But maybe just enter would do.