I was playing SS2 today while I accidentally assigned F1 to Anti Entropy Field. This breaks the shortcuts for Psi powers and since I've been playing as a PSI based character, it severely affects how well I can play it. Is there any way to reverse this? I've tried some things of my own but to no avail.

I tried that, it didn't fix the problem. I fixed it though. I opened the PSI menu in MFD and reassigned F1 to the Tier 1 symbol using Shift+F1. All good now.