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And besides not being included on every keyboard, it's not an command key, but a text-mode toggle, in every other desktop app.

I also have no "insert" key on my keyboard. And tab just cycles through various form controls on the right..

fn+return does the trick on macs.

Tab works once you focus the map itself by e.g. clicking a node.

If it makes you feel any better I have used other mind mapping tools and Insert was intuitive to me.