When a new custom profile category is created, the only data which the administrator can enter is the name of the category to be displayed as the form field group header. This extension will add an extra description field to the create category form, and associated database table column. The description field will be configured in the same way as the description for custom profile fields.
Any text entered in the description field will be added as a static form element immediately after the category name is displayed.
For discussion: should we add a "display it" check box, as discussed above for the custom profile field description display MDL-26343 for consistency? Since this is a new field, there's no backward compatibility issue, so I'd personally not bother.
I have a number of requests for this (for our Sept 2011 release) and am more than happy to program myself and offer a patch. If whoever triages this thinks that's OK, please assign to me and I will add to the OU development schedule over the next few months.