I haven't see the beta, but sounds sensible to me. As far as I can tell, the options are:
1. Use ADE page-map, Daisy, or ePub 3, if it's defined to match print page numbers. If that's not already in there, it'll likely get added.
2. Determine some arbitrary length like what Kris has done. Since it's not ADE, using ADE's determination is either quite difficult or not possible. Besides that, either go by number of screens, with each being a different page, or pick some length to mimic an "average" page size, with that having the benefit of the #'s being the same on all devices, so it's easy to move between. Seems like a good choice.
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