Ah those nice days with behind glow...That was awesome with Construct Classic! Why not add the same thing to C2? I used to combine it with some other effects and got an awesome picture in the end :)
2)Add "radius" parameter to glow and blur effects
3)Add "grain size" and "speed" to noise effect
4)Motion Blur(I know it's almost impossible but hey I have dreams too)
I guess that's all for now.