[whpalmer4]

At the moment, there's no good way to have only part of your data synced. To submit a feature request, use Help->Send Feedback.

If you don't mind having a subset of your data that won't show up in the same views as all of your other stuff, you could try putting the sensitive data in your Archive, which is not currently synced. You would have to open the Archive and view those projects and actions separately, however. Another route would be to make an additional user on your home machine, keeping the NSFW stuff there. In either case, you wouldn't be able to see a unified view, and you wouldn't have the sensitive material available on your mobile device. If the examples you provided are representative, it sounds like this might not be a deal-breaker, unlike, say, trying to keep your grocery shopping list in a separate database.