Sorry, i missed your post
No, enblens.fx do not have source texture which is content of frame buffer, copying data to such texture is just wasting performance, because lens are overlay sprites and nothing else. For more complex lens effects, another shaders available.In that case, any chance we can get access to register values in lens? I was going to write out the values to pixels from effect and read them in lens, but it lens is first, I can't do that.
dehydrated
I have never seen ao or shadows issues dependent from water, so can't fix that. It's probably per videocard or game setting.
ARK
Increasing quality of AO or filtering quality. There are several ways to do that at different cost of performance and visuals, hard to explain in short.