Open a dev console. Use the following syntax. You can substitute the bind key, and buy menu options to suit your own needs. This is for using F5 to buy a molotov. Bind "F5" "say /buy; menuselect 3; menuselect 1; menuselect 1" Hit enter, then close the console. Make sure you do NOT use F1 or F2, as these are standard keys for voting functions.