This is a bit specialised but I just found it:
If you have a multipage document such as the plans for a house you can have a different scale factor on each page if you turn off "All pages in document the same" in the Options dialog's "Page Size" tab.
Then you can set different scales on different pages. E.g. 1:100 for house floor plans and 1:500 for site layout plans.
Phil
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