Adding an alias is probably the easiest way and what the majority of IRC users do.
ALT+R > AliasesPut code like this in:
kb ban $chan $1 2 | kick $chan $1 $2-
Then just use
/kb nickname reason - in this example, it will ban *!*@hostname, but you can change the ban type to what you want. 2 or 3 is recommended.
Regards,