I love your extension and I am building my foto site with it. A feature that I miss dearly is the possibility to write a short text about the category (for example: my holidays in France) to inform the users in general about the "album" and not only show pictures. This would ideally be done with "wrapping" an article. The idea: first an article with a headline and a short text is displayed and immediately below is the content of the phocagallery component.
This is not quite the same as the comments panel that you already provide. Comments, ratings and geotaggings can be useful on category level, but for me the comments (and the ratings and the geotaggings) make much more sense on single foto level (i.e. "that was wet!", "funny!", etc.).
I would place this functionality in:
- Menu Item Manager
-- Menu Item: Edit
--- for "Phoca Gallery Category Layout" and "Phoca Gallery Category List Layout"
insert a line "Wrap Article ID:" and a field to enter the ID of the article manually
I don't know how easy this can be implemented, but you could maybe use some code of an extension of Eike Pierstorff. He provides an extension that can display articles in any module position via wrapping.
See his module "mod_placehere_v121.zip" - link: http://diebesteallerzeiten.de/blog/module-15/
I hope that my explanations of the idea are understandable

Many thanks in advance!
Raphael