Hello!
I was faced with problem about that my custom fields can not be grouped properly as I want.
In the admin panel it only displayed one fieldset with name = "default", and the rest are ignored.
Also I would like to have multiple modules with different sets of custom fields. For example, one module in category for the search with one group fields and other set for another search. But presently I can to choose in the module all custom fields at once. Can we choose it separatly, only desired custom fields?