So Many Ways to Set Up Proxies!!
But if your proxies don't work, it doesn't matter how you do it...lol 
Still, I've probably played with this aspect of SER more than I've explored any other feature.
To clarify: I meant setting up the SAME proxies in different ways, regarding testing, removal, using a proxy server, flat file sources, web sources, update frequency, locking, and more. A lot of fun playing with all this, and more than one effective way to set up!