Many Single Sites, One Plugin directory – adjust plugins_url()

I guess what you are saying is that it then ‘exports’ the wrong system’s xml (I’m not familiar with the plugin) ?

Ideally the plugin itself should be including/using the code rather in such a way so that it still knows the context/system in which it is being used irrespective of where the code is stored.

Have you tried seeing if the plugin author can update the plugin code rather ? Or perhaps getting someone to look at the code and offer a fix for it.

That would be a better solution rather than messing with htaccess.