Mirror Laser in a Scene

When you create a sinus wave and then do a X rotation you have a wave that moves the sinus, now in the options there is a general switch to mirror the laser permanent (or when you switch it back while Live is running is also possible), that would mess up other scene's so i would like to do it on a scene base not in general, for most things it's enough to set it to a Y rotation of 0.5 to get the mirror effect.
I tried many ways to get those sinuswaves on a mirror effect but i can't figure this one out.
Also there is an option on the laser to set Z-Clipping, by playing with it i get nice effects but still it's a bit vage what it actual is and also i can't get in any way to mirror it...

Any Tips are welcome.