I understand your frustration with the procedure of scheduling you described
a) publish the page that has a current version and a future planned version
b) then unpublish the same page
c) then open the page
d) then more actions schedule
This is how this is implemented now with simple steps that will not alow the user to do all four things in one step for a practical reason.
Regarding your last post about the unpublished date which remains after publishing. This is a bug I have logged it to be fixed in next release PITS
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