Usage: customset cldbid={clientDBID} ident={ident} value={value}

Permissions:
  b_client_modify_dbproperties

Description:
  Creates or updates a custom property for client specified by the cldbid. 
  Ident and value can be any value, and are the key value pair of the custom property.
  
Example:
  customset cldbid=4 ident=forum_nickname value=John\sDoe
  error id=0 msg=ok