EyeAdaptation.fx brighten hard limit

[Deus-nsf]

Hello, thank you so much for the eye adaptation shader, I use it to great effect! If I can suggest a possible improvement, would it be possible to define hard limits for brightening or darkening?

For example in some situations you'd want the game to brighten with a more agressive logarithmic curve if you see what I mean, so just lowering the brightening value would't work because it would avoid high values brightening sure, but not brighten enough to begin with.

It's hard to describe I hope I'm not too obscure about this!