I've been trying to publish my proxy app through the precentral feed on preware. However, I still haven't been able to find out the procedure. Therefore, I will make the app available through my own feed for now.
People who are interested in trying out my app, should add
to their feeds on Preware (Preware->Manage Feeds->Add Feed).
After updating your feeds, you will be able to find it in Preware under the Category "Available Packages->Application->System Utilities->ProxySwitch"
Let me know how the app works for you.
I'll post here once the app has been added to the precentral feed.