Oh I know about both the upvote/downvote gestures..

What I'm saying is... once you swipe to upvote/downvote, you should be able to swipe again in the same direction to undo the upvote/downvote.

That's basically how all the swipe gestures work in any app.

I also like the swipe gesture customisation options in Apollo,

Maybe you can add something like that as well (with option to completely disable it).

Maybe get opinions from others about that...