YW. I tracked 112 down by using QfG2 and SQ3 as reference. Since you were using addMenu, I searched for it with SCICompanion's "Find in Files" and then looked at what they did. QFG2 uses "(SetMenu 1289 112 0)" to disable a menu item, but doesn't define 112 like SQ3 does. In SQ3 they don't disable menus, but they use "p_said" with setMenu, which is defined in system.sh as 109. Also defined is "p_state" as 112, which confirmed for me that 112 was the enable/disable subcommand mention in the scicompanion documentation.
Edit: I realized the SQ3 version I tested used the decompile archive source, while the QfG2 was a plain scicompanion decompile. Suddenly makes sense why SQ3 has "p_said" when QfG2 did not.