Live Opponents filter

I always enjoy rides with Live Opponents and I often pick a ride based on the number of active riders. I know the newest movies have often the most number of live opponents, but for the movies section. Would it be possible to:

Add an advanced sliding-filter option "number of live opponents"
-or-
a checkbox-filter "Live Opponents" when there is at least 1 other user riding?

Or instead add a sorting-option (top-left corner) by "number of opponents" when a filter is already active?