Everything has the same proc rate, which is scaled up to 2 procs per minute (ppm) for the mainhand with 255 sex and 1 ppm for the offhand with 255 dex. With lower dex, the ppm value goes down. With that said,
http://www.project1999.com/forums/sh...60&postcount=1
Gives you an idea of what sort of hate is being generated by type of proc.
In summary,
DD/DoT/Lifetaps suck (approx 1 point of hate per point of damage and 1 point healed (for taps))
Snare/pure stun (duration) is mediocre
Ykesha is pretty nice (seems to have higher base hate from the 0.1 stun than duration stun), adds in 1 point per point of damage from the DD component as well
War epic slightly higher than ykesha
3 poison counters trump all (blade of the black dragon eye, a bunch of VP weapons,
possibly the claw impaler (afaik, no one tested it and I got lazy)
as for the second question,
warrior kick can start to stun at 55, and afaik, skills don't 'stay high' if you delevel. They match the max that skill can be for that level. So no, you can't.
My suggestion for a leveling warrior:
Group with someone who can root and go dual lammies (more hp!) or staff of battle. If you're bent on trying to hold aggro without root - dual claw impalers might be for you.