If I could add one advanced feature it would be spot-selected white balance, but I'm content with the controls for the most part. If I could add one basic feature that really shouldn't be an issue, though, it'd be to import screenshots. Why the hell are screenshots excluded? I have this near-perfect photo editor and can't edit 1/4 of my photos. I know screenshots aren't ideal for printing but they're good for testing crops and testing edits of photos, the latter I can't do without making copies of photos thanks to this app's strange limitation. Yes I can test edits on a single image but I would have to note and undo every edit to try the next. It just seems so much more inefficient than simply allowing screenshots to be edited.Edit: added one star. It's good that screenshots aren't completely excluded, but I still wish they appeared in albums like normal photos do. In an attempt to declutter, per developer's response, I feel like they've actually created more clutter in making screenshots harder to navigate and cause needless frustration by making them disappear from albums they're in. If you want to declutter the normal camera roll, that's fine, but favorites and other albums should be left alone.
Screenshots are there, we just hide theme to declutter. In the Album selector, pick the Screenshots Smart Album and browse and edit to your hearts content.