I downloaded a trial version of ArcGIS Publisher and the second question on this page suggests that editing is possible in addition to creating PMFs:
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Can I edit a PMF with ArcReader?
No, ArcReader cannot create or modify the published maps. You need ArcGIS Publisher to create or edit a PMF.
Ultimately I would like to add a layer to an existing PMF and republish the whole thing.No, ArcReader cannot create or modify the published maps. You need ArcGIS Publisher to create or edit a PMF.
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