on ur ban\'s you are just banning the nick so all the person has to do is change nicks and come back maybe do

if ($1 == .ban) { mode $chan +b $address($2,2) }

same thing for unban

if ($1 == .unban) { mode $chan -b $address($2,2) }

and on ur kickban

if ($1 == .kb) { ban -k $chan $2 2 }

you can also shorten some of the code by useing regex ex:

on *:input:*: {
  if ($regex($1,/^[+-][qaovh]$/)) { mode $chan $1 $iif(!$2,$nick,$2) }
  if ($regex($1,/^[+-][impRslk]$/)) { mode $chan $1- }
}