The pressure-used-for-strong-encouragement technique and the strike-with-all-your-force technique are two very different applications of a flashlight used for self-defense. I wonder how much a TID would help the pressure techniques if one used the techniques correctly. The bottom end of a Mini-Mag 2AA light seems like it would be just as effective as any TID. Once you've got the placement right, any pressure from a hard object will work. The person will either let go or move in the direction you want or drop to their knees.
However, these pressure techniques require a lot of practice to use effectively, especially in an emergency. I would never try to use them because I haven't trained nearly enough.
On the other hand, a hammer fist with the flashlight sticking out from the bottom of your fist is very intuitive. Again, the bottom end of a Mini-Mag would work for this, but a TID seems like it would work even better, and be scary-looking to boot. I should hope that a TID would not fall off (or fall down the light) in such a situation, as that would be worse than having no TID at all. Has anyone's tested this by hitting their TID-equipped light on a hard object?