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OO has more underlining options than most programs. Fortunately, there are an even number of them, cycled through by repeatedly pressing cmd-U, so just adopt the habit of pressing cmd-U to start underlining, and cmd-U 3 times to end underlining. It should work fine with any program that simply toggles underlining, and can be done so quickly it is unlikely to disrupt the note-taking.

You could of course wait for them to implement the requested change, but there's no guarantee they'll ever do it, much less in a timeframe of interest to you...