Disable Power Pivot Menu

[Artik]

As for disabling the Add-In - I thought about it. but I think it is application level, no document level.

Yes, disabling the add-in is at the application level, not the particular workbook.
However, you can use your workbook's events to perform certain actions at the application level. For example, you can use the Workbook_Activate event and in it, remember in a global variable whether the add-in was enabled, and then disable the add-in. And in the Workbook_Deactivate event, enable the add-in, provided that it was enabled when the workbook was activated (check the value of the global variable).

Artik