For really simple documents that only need to change the first(s) page(s) it works (almost) OK, but users trying to do more complex tasks like changing the first page of every chapter will probably end with a big mess...
The menu is appealing because it promise to "solve" the page numbering issue without the need to learn how to set-up/apply page styles... but at the end of the day it takes more work to use that menu than doing everything the right way...
So, you know: be prepared. I think there will be a lot of LibO users with page numbering issues in the future...