[rhelgeby]

This is not the place to discuss this, I'm using this thread for ZR update notes only.

Short answer:
Technically it should be possible to create the lightning effect and hurt players within a SourceMod plugin, the same way as other plugins create effects. The ZR 3.1 branch probably won't get more ZH-like features, and a 4.0 release is far ahead in time.

If you want to get more info about this you could try the Scripting forum or the request forum.