We don’t currently have a theory team lead to really direct the process (the position is open, though if you want that position you’d probably first have to stick around for a while). So basically theorists can join in discussions, for example helping with coming up a realistic way to limit plant gameplay:
that’s the first thing that comes to mind, but also things like bringing up inaccuracies / discussing scientifically plausible additions to the game, can also be done.