This would be hilarious. I would like the grunts to have more abilities than standard spartans to make it fun. Like, their little booster that helps them reach ledges.
I mean...do we need it? No... Should 343 use resources to make this? No... Should 343 use resources on mod support? I'm all for it!
I imagine 343 would add a good and popular mode to action sack if it became popular, and I imagine that would include mods.