For future reference with this and other addon keybinds, if you can't bind it via the addon options menu, bind it via the base game custom controls, and then set the custom control keybind against the addon option. BUT do note that some mods are hardwired to use these controls - e.g. Use Action 17 will switch you from your rifle to your pistol. Binding this keybind and setting it against some addon option (e.g. ACE Medical Menu) will perform BOTH actions - switch you to your pistol AND open the medical menu. Plenty of testing is the only way to be sure.