When rendering in maxwell, I used to send my files to Studio from FormZ, make adjustments then render to maxwell. I have found that in maxwell version 4.2.x this work flow is no longer reliable (studio will crash repeatedly).
So lately I have been using maxwell's plugin the way it was intended, namely sending the render job directly from formZ. One disadvantage I've found is that maxwell will render to match whatever resolution you set your image size in formZ. This is not a very good solution when you have a very big model, and you want to test render.. You have to set your screen resolution small then send it to render. Of course, since you're also modelling, then the screen resolution cannot be small... So I find myself going back and forth between large and smaller screen resolutions.
I know what you're thinking: That's what fire is for!... Well, not really. If you use fire, it cannot handle complex scenes, (it's just too slow) and you cannot really see what's going on.
Well, maybe you get the picture. I find myself wishing to have a place to set the render resolution without affecting my screen resolution when sending the job to render in maxwell. Maybe this is already something in the works? If so, great! If not, maybe it should be considered?