@bella3039 The new mod system in 2042 does some of what you're asking for though i think i varies by gun (via heavy/medium/light/AP ammo types, different barrel types/lengths and attachments), and aside from saying old BF games have usually had a few guns doing exactly what you ask for, no idea if they'll follow a similar pattern with 2042.
But i don't see why they wouldn't when they've always had selective fire modes before, as well as some guns performing better in certain modes (AN-92's two-shot burst at 2200rpm comes to mind).
We'll find out one way or another in the beta, but if portal does include guns from bf3/4 with the same handling they had in those games, then most of the features and guns you asked for are already in the game in some form or another.