Great application Ryan! Just discovered it recently and love it.
This is a request for an optional @ symbol in the shortcut bar. Some 3rd party keyboards make this commonly used character less accessible than it should be for GitHub...

That's actually a quite interesting idea - we could then use the normal keyboard again with the return key. One downside I see is that the markdown bar would get (more) confusing: it would house preview, markdown shortcuts, image upload and @ / # (for when we implement #219)
I am speaking from absolutely no iOS dev experience here so take with a grain of salt because I have no idea about the amount of effort required. Can you implement a customizable bar that allows users to select what they want to appear there from a set of useful formatting shortcuts, preview launcher, and symbols?
One downside I see is that the markdown bar would get (more) confusing
I agree with this but I also have some ideas to make typing code easier. Possibly short cuts for:
< >, { }, [ ], and ( ) that when you press them it nests you inside of them. This is because typing code examples on my phone is a nightmare.
Maybe we could add a button to the markdown bar that toggles to a different set of buttons?