Finer-grained server selection
For instance, I live in the Western US and I know that no matter what I'm never going to get acceptable results off the Eastern US servers. I'd like to be able to checkbox the servers individually so I can pick five or six geo-local servers to test and get my results a bit faster.
Additionally, I'd love an option to save these between sessions so I don't have to re-check things every time I load the tool.
My use case may seem a bit odd, but I'm currently in a major dispute with my ISP that has me running the test tool several times a day right now. This has been going on for two or three months minimum already.
The server selection support via checkbox is now sitting in pull requests, and should be added soon.