They should add an assault cannon with an ammo backpack to ogryn.
>high rate of fire
>give it decent cleave against trash mobs and "lighter" elites like shotgunners
>3000-5000 ammo, the whole ammo "reserve" is the magazine
>the magazine can't be reloaded and you can't take ammo pick ups
>can still benefit from scavenger
>integrated heat mechanic like heavy bolter in SM2
>to fire need to brace the weapon and spool up the barrels
>minor DR bonus (maybe 15-20%) due to an integrated plasteel gun-shield so you aren't a 100% sitting duck
I think it'd be a cool addition.
Basically pic related but ogryn is 2 handing the gun.