No way to update the podcast URL in WFED after itunes-podcast plugin creates it

The itunes-podcast plugin has been a great help in creating the PCST and WFED frames demanded by iTunes, but the WFED frame created by itunes-podcast is always empty and cannot be updated. I see in id3/apple.py that both WFED and TGID are defined as text frames, but only TGID can be managed via eyeD3. It would be terrific if eyeD3 could manipulate WFED as easily as a TGID frame.