I'm a bit old school and tend, so far, to use Zenphoto only in a photo-related folder, not for an entire website. And I am not a social beast. That being said, I would like to add:
– A theme for the administrative interface.
Keeping it different than the front end has 2 benefits: it doesn't make front-end themes more complex, and it allows one to keep a very different look for behind-the-scene administration. That way, one knows very quickly what one is doing (seeing vs administration).
Administrative themes would fulfil two purposes: add responsivity, and allow one to modify some fields (ex.: if my "Custom data" field is used to explain how to go to the photo location, then I could make its description better so people who upload photos would fill the field correctly.
– A two-level photo processing.
Even cell phones take large photos. And my DSLR takes 24 Mb photos. Ideally, I would love to upload my photos directly – maybe even upload the raw files – so that I find everything in the same place. Zenphoto could then prepare a 1st-level permanent cache with 100%-quality pictures @ 1600 x 1200 px that would be used for all further gallery processing.
If I want to use processed photos elsewhere on my website, the current cache system has one flaw : the cache may be cleared, which means I lose all processed photos and see a blank square on my other pages.
– Easy loading on the road.
I use a DSLR and do not upload photos on the road. But if I were, I don't think I would add extensive descriptions from a cell phone. But for uploads, it might be nice to have a simplified user interface where one would directly go to the Upload page. For example, http://mydomain.com/zenphoto/admin would reach the general administrative page, but http://mydomain.com/zenphoto/load would directly reach the jQuery or elFinder upload page (easier access on the road).
– Revise your position on automated installers.
I haven't checked all of them. Fantastico used to lag, but Softaculous (and another script provider) seems to have replaced it on most ISPs. From what I have seen, Softaculous updates its scripts very quickly – for instance, Zenphoto was upgraded to version 1.4.8 within 2-3 days.
Considering the easy installation and upgrades provided by those automated installers, I think it would help users to keep their versions up to date. A statement on the home page saying that "in many cases, you can install Zenphoto on your website with a 1-click install by going through your website's control panel and checking for Softaculous or another script installer."