Undocumented Feature

The title isn't a euphemism, this is actually an undocumented feature:
Right clicking will leave the current building mode if you are in one and will cancel tasks if you aren't.

Two people independently complained about the lack of such a feature and I realised that it should have been somewhere in the instructions.

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Is there an alternative for those of us with button-challenged mice?
gcewing: Option-click should work, assuming you're on a Mac. If you're using a one-button mouse on Windows or Linux, I'm afraid you have bigger problems than being unable to cancel tasks.