Hi,
yes RT will cover this, but OGL preview will be faster and cheaper, it all depends in how complex it's to implement

Regarding stopping, tuning exposure and resuming, it's what i do but it is not efficent, since each time stop rendering some savings are done and it may be very slow.
An option to allow exposure tool's priority over rendering is a more elegant solution imho

Regarding hue control for textures, how does experts do ? Eachtime you have to adjust a texture's color, do you go into PS, tweak, save, load into maxwell and fire a new test ? Isnt there a workaround for this, i.e. placing a multiply color layer onto texture's so you can change hue of that material (i couldnt do it in an efficent way) ?
bye
Paolo