Mission tonnage and mech variety

[Don't Panic]

I got thinking about this and came up with a few mission requirements that could force variety:

1. Need For Speed. A stated minimum requirement for 1-to-4 of the mechs to have for a top speed. This could define smash-and-grab missions.
2. Varied terrain. Knowing that terrain is so challenging that JJs and LRMs would pose a restriction.
3. ... trying to think up more

Such restrictions could add variety to game play, reintroduce the usefulness of light mechs, and perhaps there could be more interesting rewards for such uniquely challenging missions.