For #5 -- that is a throw back to old apps where command-. was used as a stop / terminate -- whatever. Another alternative if you need to "send" an escape is control-[ since that is what escape really is.
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Really? I've let to find an app where it doesn't work. e.g. Safari, Terminal, etc.
It’s weird, because in previous versions it worked. I dont know when it disappeared but for some reason finder is the only app the has the window cycling menu bar item available