well I already asked muse for selectable winning poses.
apparently the assets and animations already exist, they just need to put in the work to implement (code words for we don't got time for it).
as for mid game taunts, that would only work with games that has a cast of characters that are distinctive (like mobas)
I did suggest to muse for a pilot tool megaphone that lets you voice chat the whole match. As a pilot tool you can only use it on the helm. they were iffy on it.
and likely on taunts in general because trash talking is bad in this imaginary wonderland guns apparently lives in