It is not possible for local users in subwikis to add pages to favorites

In a multi wiki environment, local users of a sub wiki cannot add pages to the favorites list for the following reasons:
1. they do not have access to the panel from the main wiki
2. they cannot execute the code from the UI Extension from the main wiki

In order to allow local users to add pages to favorites in a sub wiki, the extension needs to be installed locally (in the current sub wiki).
However, there will be another problem:
The UI Extension' scope is global, and this will cause duplicate entries in the More Actions menu for Add to Favorites item, at least 2 (one from the main wiki and one from the current wiki).