Good idea for a script
Found a bug: The first time you open the menu for the script, whether it be in conversation or contacts list, all the items appear 'undefined'.
You then click off the menu and go back on it and it appears fine.
Opening the script from the contacts list seems unnecessary because, although it allows you to see which shortcuts you can use to insert the symbols, when you click the buttons they don't do anything because there's no conversation to insert them into.