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Do the commem. supplements include all commem. including souvenir sheets? Or just the singles and se-tenants.
Yes to the souvenir sheets. I think both supplements had s/s on separate pages. If you chose not to collect souvenir sheets you could just throw out those pages. Nobody ever does.
I believe Scott generally only provides spaces for se-tens, not both singles and se-tens.
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Do the National pages have everything and do they keep definitives on separate pages from the commemoratives?
They have spaces for major Scott numbers, not the lower case "a", "b", etc listed varieties or shades. The exceptions are se-ten blocks. Plus they still may have a separate page for #C3a(!) but not for other inverted centers.
Definitives are not on separate National pages.
Be aware my info is ten years old, though nothing had really changed in all the old Nationals and various US supplements from previous decades. If nobody pipes up here, you can also try and ask Scott.