Hey Hocus, I had a look around for the WideCap program, and it's now apparantly become freeware.
However, I had issues with getting it to work with ResNet. If I entered the proxy details (wwwcache.lancs.ac.uk:8080, I believe this is correct?), it returned the error 403 Forbidden. Tried entering my username/password as authentication but that didn't work either. Can you share some tips about how you got it to work? Thanks!
edit: just re-read your post to see that you haven't actually tried it yet. I don't hold up much hope for it working then unfortunately. Maybe it's because ResNet uses a proxy configuration script rather than a server, which WideCap doesn't appear to have an option for.