It feels like its a century since last time i needed to use some good old fog, and all the standard varieties behaves like complete maniacs with the vray camera is there a plugin available nowadays or what?
Nope, not yet. Its a feature I think is being worked on. There are 2 ways around it. Do it as a scanline render and composite in post, or dont use the vray physical camera and it works like normal. 
Actually, you can you the vraycam if you use vraycolor in the fog env color map and punch up the rgb multiplier a lot.
Works just fine that way.
Any possibility of posting a simple example?