Hand poses. Not self-explanatory?
To be more specific, maybe you could double tap/hold/press one button or multiple at the same time to open a "Taunt" wheel, which has all sorts of things to be toxic or use for fun.
HOW IT COULD WORK
*- Use a hand gesture to signal to a teammate without speaking.
- Act like you're friendly with a hand pose the community decides is a "Peace" sign, before brutally murdering them in cold blood.
- If finger tracking isn't in the game. (Which would make plenty sense if it isn't.)
- If finger tracking IS in the game, not everybody can affort that high quality stuff, right?*
EXAMPLES
*- An enemy is nearby, so I can't speak or it'll give my location away. Instead, I count down from 3 using hand poses to signal when to shoot.
- get flipped off buddy*
This could be a future mod if this isn't added. (Which I bet it won't cuz this idea is stupid)