Why not create your own alias (and use it under Options > Mouse) or replace the /channel command itself and list them all in one new dialog? You'd then need to display all $chanmodes in it and check the checkboxes for the active modes using $chan($chan).mode

mIRC sends MODE $chan +b to the server to fill the ban list (raw 367) and when the user clicks the Excepts or Invites button it sends MODE $chan +e (reply is raw 348) and MODE $chan +I (reply is raw 346).