I just created my first project on Codeplex. I created 2 custom document set actions that could become handy when using document sets in SharePoint Designer workflows.

With the first action you can get a property (a column value) from the upper document set while the workflow is running on the underlying document. The value is stored in a local workflow variable and can be used to update a column of the current item or to make a workflow decision.

In English the above action looks like:
Returns the Column of the parent DocumentSet in Variabel.

The second action I created unrecords all documents in a document set. This action becomes handy if you want to send a document set to another location while some of it’s underlying documents are in-place records or records.

In English the above action looks like:
Unrecord all Documents in DocSet

You can find the codeplex project here:
Custom Document Set Actions