"On double-right click" and "on double-middle click" do not seem to be registering when testing in Chrome, IE and NW.js. Works correctly in Firefox. I posted about it in the C2 help forum and someone said they reproduced this as well, so I guess it's not just me and could be a bug.
capx: dropbox.com/s/qsjwqvhjjsysmix/doubleclickbug.capx
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It's not a Construct bug, browsers have removed support for this I'm afraid.