This is an old thread but I'm going to reply to this anyway, as I occasionally look to see if this feature exists. The only reason I'd want to use another editor is when I'm writing most of my code but not yet ready to test, and I want to use an external editor's feature where a selected word (like a variable name or function) preceded and followed by spaces or some other special characters, automatically highlights all other instances of that text in the file. It's useful for when my scripts turn into spaghetti code and I can quickly see where the other instances of that variable are.