It would be convenient to have a parameter for BIS_fnc_AddCommMenuItem that will determine whether BIS_fnc_ShowNotification is called.
This way you can opt out/in of whether you're notified during gameplay that a support was added.
Useful for instances when the communications menu is used for executing stuff, not necessarily a support.
I attached the file "fn_addCommMenuItem.sqf" modified with a third parameter for whether or not a notification is displayed during gameplay.
This could be accomplished just by using a modified version of the function, though would be more convenient to have it in the official function.