[EDITED]…
Yes, it is a bit surprising that the “Sizing applies Time Stretch” mode of the Arrow/Select tool in the Key Editor doesn’t do what we’d at first expect. (In fact it only has any effect when you resize a note which has Note Expression… when active, it stretches the Note Expression along with the note itself, and even then, it only shows the result once you release the mousebutton).
Your own method is the only workaround at the moment, I’m afraid.
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