Is there a mod that allows you to disable dreadnought random spawning in non-elimination missions?

I mostly play DRG with my wife, she as an engineer and myself as driller. Our skills are at the point where we are generally comfortable playing hazard 4, except for dreadnoughts. So every time a random dreadnought spawns we are in trouble unless I bring my gunner instead of driller (which I don't really want to do).

It's quite frustrating because hazard 3 is mostly too easy and hazard 4 is great, except for when we get a random dread spawn. So I would like to get a mod that allows us to disable random dread spawns. Don't want to mess with anything else.

Thanks!