How to use different vray camera settings, like DOF or EV on each scene

For 3dsmax there is an addon called scene manager, which helps to add unique camera settings for each views.

I never found similar for sketchup, which saves Vray-s exposure values, depth of field, etc …

Any Idea for an extension or an accurate workflow?

You can try with ‘Save Render Settings to File’, then you can load that .vropt file with a scene. And so for each separate scene, you create a new .vropt file.