Feature Request: Allow files outside directory when synchronizing project

The "Synchronize with drive content" function for projects is great! Especially when you're creating lots of little files and are liable to miss adding one manually to your project.

However, it would be nice to have the ability to maintain a folder outside of the main project directory.

For instance, I'm working on the front-side development of a WordPress plugin, keeping all the development files outside of the plugin itself to keep things cleaner. (There are 60+ JavaScript files alone that are combined and minimized before being added as a single file to the plugin.) I would also like to include the other plugin files in this project, but they are in a completely different place, and "re-synchronizing" the project deletes them from the project.

Is this kind of thing possible, perhaps with a context menu item? This could be either on the main project folder ("synchronize") or by tagging the folder(s) you want to keep ("save").

Thanks.

In the future projects will be anhancement - joining with FTP, FTP synchronization, each folder in project can be mapped into existing folder...