I've updated to R100+ recently and tested the new webgl effects... It's potentially awesome!
But in practice, something annoys me: there are so many effects (that a good thing), most of them are not clear at first sight and I have to apply/launch the game to see what it is... This is an important waste of time.
Could it be a way to... I don't know... have a preview of the effect before lauching the game? Directly available from the effect selection menu, cf. this screenshot:
It doesn't have to be something dynamic... Of course it would be great, but something more visual (an illustration?) would be more "efficient" than a simple text (for most users I think).