Well - go for spirit.
It's far more flexible than normal HL1, but still it's not source engine. I found it really nice if there still were good HL1 mods after HL?'s release.
You also wanted to have some supernatural/psycho abilities? What about a beam of mental energy (egon with a different model), a laser beam shot out of the eyes (gauss with different sprites/model), rockets that you control with telekinesis (cough), remotely detonated packets with explosions of black energy ... yada yada yada. You certainly could produce something useful without coding, but the basics would still be tha same.
Good luck!