I don't use these commands very often myself so I'm not 100% confident of this, but try typing this in the battle room:
!setoptions disabledunits=mahlazer+zenith+raveparty+corsilo
I am assuming you are trying to play your game in an ordinary battle room through a lobby. If you're trying to create a scenario/mission, that's way outside my area of expertise: maybe try @KingRaptor or @_Shaman .
I further assume that in addition to the listed superweapons you also want to disable the Disco Rave Party. Remove "raveparty" from the above if that is not the case. You might also want to consider disabling Big Bertha ("+armbrtha"). I would not disable Missile Silo - it is the best answer to a number of things, and removing it would warp the game a fair bit.
