There’s already an existing thread discussing to expand the gesture support on the mobile Plex clients. While not mentioned in the OP, the thread also mentions swiping left/right to fast forward/rewind (or tapping the left/right side of the video to achieve the same).
Please comment/vote in that thread in order to help us avoid distracting or cannibalizing votes. Unless I’m missing some unique aspect of your suggestion I’ll close this thread as a duplicate.
