Hello,
first off: zenphoto is still my favourite gallery management system and I love how versatile it is. You're doing a great job!
One thing I would wish for though is some form of customization options for the backend. I come across computer unsavvy clients a lot. Most of them update their sites rarely and so the more intuitive the interface for them, the better.
Now the screens for album and image edit have a lot of fields that I find I don't use in my custom themes in most cases, so they unnecessarily clutter up the interface.
One easy solution I could think of would be adding explicit ids and/or classes to the backend tables' rows and columns so they could be styled with custom css and or js (e.g. via a plugin). Marking the necessary fields red or adding comments for what format to enter data in would really help a lot of people I've worked with a lot.
What would you think of something like this? Too hackish or a valid solution?
Another thing I've been working on that has been quite helpful is a plugin inspired by advanced custom fields for wordpress (http://www.advancedcustomfields.com/).
This allows for highly customizable fields to use in the backend that can be checked from the theme. In the backend the album edit might look like this: http://i.imgur.com/UvE9TA1.png (could be made prettier of course). Now the same thing could of course also be solved with code blocks, but again that's not a very intuitive solution.
Is there a plugin like that already that I don't know of? Do you think that could be interesting? The next step for me would be to allow the creation of fields from the backend plugin options, right now it has to be done manually.
Thanks for your feedback,
Philip