Please seriously consider adding 'indentation guides' to the editor. It is a feature of my current editor (Programmers notepad), which I would find difficult to live without.
Quite simply it places a faint vertical line at the end of a tab character and gives a very clear visual representation of nested code, and particularly comes into its own when code spans over several screens and the start and finish brackets can no longer be seen.
Implementing this feature would instantly get you a new customer and would enhance what appears to be a great editor