@trashgirlfriend I remembered, #Walkr, a space gamification fitness app, have an option to "boost" steps when you're about to go on a long walk/run/jumping rope session. You can use it once every 24 hours only (and only lasts for 2 hours IIRC).
I think, now that you suggested it, that was maybe their solution to keeping the sensitivity fixed for their game, but giving users a chance to earn more if they're about to engage in a long session.