[schapplm]

Is there anyway to add a feature to this Addon to exclude certain shows or movies?

I do not know, why this would be needed, but it is of course possible to add featues. Just download (or fork) the code from github and modify it. If the changes are stable and usable, we can also add them to the public master version in the Kodi Addon Repository.

What's the best way to implement this so that my watched statuses will update over the internet? I take my laptop with me for travel often so I'd like what I watched to be reflected on my Kodi at home when I return. Does the dropbox integration still work? When I select it it says "Dropbox API error"

To my knowledge this should still work. Can you enable debug logging and upload a debug log?