What rides at each park have the single rider lines?
What are you talking about? Every time I've been to WDW, RnRC has ALWAYS had the single rider line open. The only time it's been "closed" is when it was too long and they didn't want to let any more people stand in line.And for the record -- not all of them open every day, depending on crowd size.
Test Track's is almost always open, while Expedition Everest opens late morning and on busy days, and RnRC often doesn't open the single rider line.
It's not the most reliable way to do your planning...
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