You may also make custom menues in the Communication Field, using the SOM Module. I managed to compile the following example using codesnippets found at the Official Forums:
waituntil {!isnil "bis_fnc_init"};
BIS_MENU_GroupCommunication = [
["User menu",false],
["Not active", [2], "", -5, [["expression", "player setdamage 1"]], "1", "0"],
["Active", [3], "", -5, [["expression", "player setdamage 1"]], "1", "1"]
];
showCommandingMenu "#USER:BIS_MENU_GroupCommunication";
The quoted ad hoc example should kill your player. Not very useful, but you may of course replace the player setDamage 1 part with any code you like. You may also replace "Active" and "Not Active" with titles of your own choice.
My limited testing implies that The "Not Active" option is not available to select in the Comunication menu because the last digit is set to 0 (zero). It becomes slectable when "Active" is changed to 1. Due to an unrelated CTD I am unable to do more testing at the moment (no electricity in my house last night). Any findings regarding this function is more than welcome though.