Mother of invention... Well, this may not be ideal, but my need was far beyond taking the time to do everything in an ideal method.
The following hack adds the following capabilities:
1. Delete individual custom attributes (TODO: add a confirm message).
2. Does not display the upper section if there are no attributes.
3. Added upload CSV file to parse out two of the attribute fields (description and caption).
Caveat - I probably should have put in some mechanism to check for existing and/or archive existing off, but all of my surveys are new... sorry
Two files in the attached archive are based on Version 2.00+ Build 121204 - the other two files are the custom UNC file and an CSV example.
Paths are not included in the archive - should be:
...application/controllers/admin/tokens.php
...application/views/admin/token/managetokenattributes.php
...application/unc/UNC_CustomAttributes.php