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Document the Special Completion characters
I know PowerTab has a whole bunch of magical characters that cause it to tab complete differently, but I don't know (or can't remember) what they all are. I think that's about_PowerTab_usage (is everything in there?)
In any case, you should put that information in your documentation wiki here, and link it on the front page, there's a ton of functionality in there that's hidden away (eg: #nn to tab complete the nnth item from history).