First off, the imposter plugin is brilliant. Works great to keep perceived while being well optimized.
In the forward pass, I would recommend adding alpha to coverage with sharpening. I added it to the shader on my end and it certainly helps with aliasing when I'm using MSAA. You don't really need it for a deferred setup because of post AA, but it helps a lot with a forward based target like VR.
https://medium.com/@bgolus/anti-aliased ... 177335ae4f
I think it would also be helpful to have more shape configurations (perhaps custom shapes) to optimize texture space more. For instance, a planar projection for impassable hallways, or semi cylindrical for objects that you would never see the top of, etc. That way you don't render and store texture information that would never be seen or used.
Thanks for you time and such great plugins!