So I dug up this old thread about a week ago and posited that it could have some interesting uses. For those of you that don't know, the mimic glitch actually does allow you to multi-target spells that are normally single-target only. People who are better than me about diving into code/glitches (the_roth, neerrm and myself086) in the speedrunning community have dug in and found some buggy things with this glitch. Most of them aren't RTA-viable yet because they rely on the Nuke animation, which we've been experimenting with in the form of putting Crystal into the inventory. The main finding is that by doing this glitch in places other than the overworld, you get the Dummy item, draw the fight, and then can deal with some glitched-out rooms. The video I have linked below involves finding Kainazzo in the Old Waterway, then having the airship immediately jump from the end of the Kainazzo cutscenes to the Airship underworld cutscene:
https://www.twitch.tv/videos/214119426?t=01h57m02sYou can see that the backgrounded text boxes scroll slowly, as if they're part of the opening scene. Saving and resetting underworld allows early Dwarf Castle access without ever setting foot in Baron Castle, Toroia, or Tower of Zot.
Anyway, I know most people here aren't interested in speedrunning, but if you're designing hacks and switching spell target data, keep in mind that some extremely wacky things can happen.