How do I make Collaborator 9.4 forget users passwords?

Happy to hear you're almost there, one workaround I thought of is to create another "dummy" script to run at a frequency just a bit higher than your time-to-live value to ensure the script account doesn't time out.  I do like the idea of configuring accounts that don't expire to avoid having to do that - I suggest you log that in the feature requests board.