I use semi-tac and it is a good switch lock. I do not understand the need for full momentary tac mode. You can just unscrew the head from the body a half turn to make the light inoperative. If you activate full-tac, that is what you have to do anyway to reset so you can use it again.
If a shortage of memory space is a problem for adding features, I would delete some menu items to free it up. Tac modes and the button lock gone in favor of a default switch lock activated without going into the menu and a user settable brightness level and even interval for the locator flash in the menu.
Press and hold for a couple of seconds from off could activate the lock without interferring with other functions, and double click from off to unlock. With that feature, I suppose the need for semi-tac mode is questionable.
Three levels of flash modes in the menu options: SOS same as it is now with High brightness for a distress signal. Medium brightness and medium flash interval or series of double flashes , and current Level 16 locator flash.
The menu would be simplified and less intimidating to many.
Distress SOS, Signal(M), Locate (L), Force Primary, RFS