I heard rumors that the devs plan on removing mission modifier entirely which I find a shame, here's some few ideas for if they plan on adding them back
Tornado should be exclusive to the desert and rather than it tracking the players, it would simply move from point A to point B and one would spawn every 30 sec each, these tornados deal very little damage but can suck up a whole bunch of random object which could either be useful or a determent, for example, it would be able to suck up crates, tumbleweeds and those GOD DAMN BODYBLOCKING CACTUSES which would make everything just so much clearer and nicer to maneuver but it would also suck up ammo and jack Daniels bottle which would mean you will have to go goose hunting for those or simply can't get to it cause the tornado is "running" away from you