I don't know that they are really all that time saving... I can type really quickly and if I have to slow down typing a command just to see if the code completer completes it with the correct command, it will actually take longer. Colored syntax isn't bad, but isn't all that important. Unless you miss things a lot (parentheses, braces, etc), you really don't need it. I wouldn't mind having those in the built in editor, but I also wouldn't use those as a reason to switch editors either. Besides, I prefer to have instant access to test whatever I script without having to reload the script all of the time. That in itself saves a lot of time by using the built-in editor.