I'll do you one better
/ss {
/set -u0 %a 1
while (%a <= $nick($active, 0)) {
if ($nick($active, %a) != $me) /set -u0 %nicks $+(%nicks,$chr(32),$nick($active, %a),$iif(%a != $nick($active, 0), $chr(44)))
/inc -u0 %a
}
/set -u0 %nicks $replace(%nicks, $gettok(%nicks, $gettok(%nicks, 0, 32), 32), $+(and,$chr(32),$gettok(%nicks, $gettok(%nicks, 0, 32), 32)))
/me slaps %nicks around a bit with a large trout.
}
that will give you this (supposing your nick5)
nick1, nick2, nick3, nick4 and nick6
Excludes yourself, includes spaces, and proper grammar. >:D