For me kick-jump(and kick-long-horizontal-jump) really cool feature. I use it even more often at last levels instead of rocket jumps...
In normal play-through no, only grenades, but when testing bugs and examining some places with cheats i lightning-jump a lot!
And some times I use lightning alt-fire to kill mobs behind force-fields, but i think this is often feature in many games.
And hmm, just in case: when place trip-mine to wall at side of saw-jumper and stay hidden, trip-mine don't show ray, but explodes when saw-jumper see you.
And finished! I think final boss really kick my ass at dominator. Cool ending story, special laughs for one more think to do, and Zortch poses when hearing story makes picture really more live!
I think i call it a day for now. But tomorrow i tried repeat play-through with generic level acknowledge and cheats to find more bugs. Now i feel slightly bug-blind, or later levels far more polished.