Just tried in Aquamacs 1.9, seems to work, except I have the Command key as meta (because of years of having the Meta key immediately to the left of the spacebar), so the M-h binding ends up hiding Aquamacs rather than moving focus left. There should be a way to correct that because Aquamacs disables some other standard Mac "Command-" bindings when using Command as meta.
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Just tried in Aquamacs 1.9, seems to work, except I have the Command key as meta (because of years of having the Meta key immediately to the left of the spacebar), so the M-h binding ends up hiding Aquamacs rather than moving focus left. There should be a way to correct that because Aquamacs disables some other standard Mac "Command-" bindings when using Command as meta.