maybe with finite state machine logic, but i doubt it. this engine ain't really made for anything but "shoot stuff, collect keys, open doors, shoot more stuff." that's all you really need, but of course more would be better. as it stands, it's really about creative use of modifiers and simple 3d models to make maps look interesting, less flat, but everything is pretty static. this isn't the answer you were looking for but.... you could try learning another program? i'm still using EFPSE myself, but i am part-time working on getting a similar 2.5d doom-like setup in Coppercube. If I can ever get that into a working state, I will release the coppercube project ccb file for others to use.
and of course you can pray to whatever gods or devils you believe in that JessicoChan stays safe, and that one day they will be able to resume dev on this promising tool. even if it never progresses further, let's still hope that they and their family is safe.