Multiple Datasource Locations using Queries are back in Sitecore 7.2 Update-2
Sitecore 7.2 Update-2 (rev.140526) was recently released, and one of the entries in the Release Notes was this:-
- Layouts and renderings
- The Select the Associated Content dialog did not handle multiple data sources correctly. It only used the first data source and ignored any additional data sources. This has been fixed. (389483)
A while back Thomas Stern wrote a post detailing a way to allow for queries in Datasource locations, so that the Associated Content dialog could be more flexible for multi-site solutions.
I tested out his solution back when the post was written, and it worked perfectly. However I found that it was broken in both Sitecore 7.0 and 7.1.