I have been searching forever for a solution to this problem.
Apparently there is a way to get Post-Processing working within Superpowers through the "EffectComposer" using Three.js, but I have yet to get it working to any capacity. Every time I try to run the script I get a bunch of errors with the EffectComposer. I'm not sure if it's because I'm not getting the actual scripts (I would also love to know how to import scripts from inside project resources locally as well).
Project with Post-Processing: https://github.com/SchynsO/DemoFirstPerson
If anyone out there still using Superpowers that could help me in solving this and getting it working, I would be so thankful!!!