Copy/paste would be nice, but what's more urgent to me is being able to select text in order to delete it, and also Ctrl+(Left|Right|Backspace|Remove), Shift+(Left|Right|Home|End), Ctrl+Shift+(Left|Right) hotkeys. I find myself trying to use them all the time. Also, double-click word, triple-click line (less important).
Seeing how strange and buggy even automatic line breaks and the cursor on multi-line documents are, it's probably a suicide attempt to add support for text selection. But I'd really love those Ctrl+(Left|Right|Backspace|Remove) hotkeys!! They should not be too hard to do*, or am I wrong?
* For someone who is into CS/PS codebase or at least into C++. I'm neither.