Forums Scripts & Popups insert chars on the command line

Is there a way to insert a character on the mirc command line?
If yes, i'd like some info on how...
Just a refecence to search on help files, and maybe some guiding if how to do it is not so obvious on the help

edit: i was thinking about a dialog where you click and it pastes characters on the command line, sort of a shortcut to avoid alt+xxxx

editbox -a $+($editbox($active),ñ) would append the ñ character at the end of the current text in the editbox of the active window.