I think this is the best proxy switcher out there, and with a couple of additions I would never need another one. I often like to switch to different proxies on the fly and this program lets me do that with a minimal effort.
Wants- I would want it to have the ability to read a comma delineated list of my own creation from a file (if it didn't have a name for the server in the list file it could randomly assign one based on country of ip and dns) as well as test to make sure the proxy was working by loading a test page and reporting the speed at which the page loaded(in the selection menu, result of load speed). Basically something to keep me from having to go through the list of proxy servers manually by testing out if they work and allow me to choose the faster ones from the list.
Also an additional button to cycle through the proxy servers instead of just one that sets it back to non proxy.