First off it appears (in a way) your looking to ctcp nicks in the channel one by one. Why not use /ctcp <chan> PING? Secondly, if it is "certain nicks" (As listed in %killnicks) that would only specify the first X nicks, not a nick-specific list.
Basically, what are you trying to achieve, and mybe i can help you better >:D
EDIT: Sorry, i meant to say /ctcp <chan> version, not ping--lil tired >:D
