Be adviced that this is the "Script Request" forum.
If someone feels up to the challenge, they'll probably post about it. There is, however, no coding co-ordinator or similar and moderation is kept at a minimum to preserve civilized behaviour.
The "staff" (by this I suppose you think of us Moderators?) are not required to honor any requests (for scripts) posted in this forum, neither is any other forum member. Some of us do take on some requests every now and then, because we might feel like it. Others don't.
As such, you probably won't see any "sorry, we can't do it" posts; you'll either see some suggestions, solutions/scripts, or nothing at all.
Or much simplified:
^DooM^ wrote:If after you have exhausted all avenues, then post your request here. Be warned though that your post may never be answered and your request may never be written.
Regarding the question in the subject; it's probably not impossible, or even hard. It does depend on whether you'd like your bot to issue add a K-line/akill/etc to the server, or do the actual killing by itself.
Your post suggests the latter, which means your eggdrop needs to be notified whenever a new user connects. The availability for this varies alot across different irc server softwares and configurations. It would also need Operator privileges in order to use the KILL command.
Personally, I'd probably look at using whatever K-line, G-Line, operserv, etc services that are available on the server(s) instead.