There's no way to recover only selected folders/files in the current version. It's whole drive only. That is something I want to add once I have a UI in place to make it reasonably straightforward.
And yes, recover should have a "force" mode where it skips files it can't recover due to errors. Out of curiosity though, any idea why it could not access that one file? Sounds like another app might have had it locked at the time. When I originally wrote disParity, I never intended it to work well if other applications are accessing the data drives at the same time.