I just rolled out a few bug fixes and enhancements to the main server:
- support for UserVoice feedback button in the menu bar
- Fixed bugs: #4023, #4156, #4858, #4588, #4703
- AR Add Release Edit search on pre-defined edit searches and advanced edit search
- Magnatune Coverart support
Many thanks to Luks, Nikki, Brianfreud and Navap for helping with these fixes/improvements.
MetaBrainz Blog 
Searching for Add Rels by type is awesome! Didn’t even know this was coming… (and I think you meant “Add Relationship Edit” in the above, rather than “Release”)