Clicking on the toolbar buttons is boring. So, one should be able to click, stay still and wait 1/2 or 1 second to switch from Navigate to Select mode.
That behaviour is confusing as hell, do you know of any other single program that does that?
I agree with Albert. That idea seems rather user-hostile. Can you provide an example use case that would significantly benefit from the proposed behavior?
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I'm afraid the idea is user-hostile and will not be implemented.