I've been using SkySafari for a few years now (previously SS5 Pro, now SS6 Pro) and really love the functionality and detailed information.
SkySafari is currently the best app for any astronomer on the go.
What kind of bugs me though is the UI.
I realize that UI/UX is quite the beast in itself and is lower in priority than general features.
And you probably currently have no dedicated UI designer.
Still I would like to see a overhaul of the menus and usability of the app, since it just kind of feels clunky most of the time.
Not only would a streamlined UI make work a whole lot faster and easier, it would also help market the app.
Some optimizations i can think of off the top of my head:
1. Implement a search over the settings so it's possible to find options buried anywhere
2. Make the UI consistent
Example: "Done" should probably always mean you're done with the current step, not done with all settings
3. The time menu could use a slider in addition to the arrow buttons
4. Options under settings should probably be reordered. Often I find myself searching for settings in one folder while they are actually in another because the names are sometimes misleading.
Those are just some examples, and a UI/UX designer would definitely do a better job at finding problems and good solutions to them than me.
Would love to see some improvements on that side.