Match UI to theme
It’d be nice if the UI elements that come in blue, dark, or light could match their colors to whatever editor theme the user installs and selects, like Sublime. The editor theme support (eg., TextMate/Sublime themes) for Textastic is good, but I feel limited in which themes I can actually use because of the jarring mismatch between the Textastic app UI and many editor themes. Speaking as an iOS (iPad) user.
Customer support service by UserEcho
I personally am most immediately interested in a full native-looking Ayu Mirage theme, but I think this feature could be generic based on background color and other particular theme attributes.