What is meant by a "Custom fields" feature?

Also, can comments automatically assume the title of the picture it comments on, when you see a comment has been made it can be confusing to work out which picture the comment was left on. Especially if no title is entered.

Say you have an automobile category and, along with title and description, you'd like to add automobile color, engine specs, whatever. When a user goes to upload, s/he can provide answers to your custom fields, and these answers then show up on the view image page.

The comment title used to use the file title, if no comment title was provided, but it got removed when query reduction was done. I'll look at putting it back into pro.

UPDATE: pro v.2.1.0 now sets a default comment title in the form field.