You could easily fix that yourself by editing dZSbot.tcl. Scroll down to part where it says:
Code:
#################################################
# DEL REQUEST ON IRC #
#################################################
proc proc_reqdel {nick uhost hand chan arg} {
etc.
Replace
Code:
puthelp "NOTICE $nick :Request number $arg is now deleted"
with
Code:
putserv "PRIVMSG $chan :Request number $arg is now deleted"
Do it the same way for the other places in proc_reqdel and proc_reqfilled so that dZSbot announces in chan instead of notice to nick.