Eh still you'd need to be within 6" for Frag, lol.
Krak is what S6? I see it kinda like this...
Mag-Strip Krak Grenades; Range: 6", Strength: 6, AP: 2, Assault 1
That kills tyrants, wounds 'fexes, hurts elite infantry, and kills light vehicles, throwing melta bombs is like a.."Wow, ain't this kida erm...evil, cruel, malicious, and sadistic?" I'd be willing to call it an upgrade for like a sarge and try a play test of it though.
Daemon Hosts: Evil ^^
Sorceress Powers: Awesome!
Drugged-up, Psyched-up Inquisitor: Dark Eldar? No in all honesty I think thats pretty cool idea, but would it really off-set the losing Death-Watch, maybe if you got to do it to your STs ^^, maybe +1 I, +1 S Fearless? Someones in the bed with Fabius Bile...