SciTE4AutoIt3 is a specialist editor package based around the excellent SciTE editor. The editor has been set up to compile AutoIt scripts. SciTE has been extended with a multitude of lua scripts. SciTE4AutoIt3 may be downloaded here: SciTE4AutoIt3
SciTE4AutoIt3 comes with a configuration program named SciTEConfig. With SciTEConfig a user may change the color scheme of SciTE. One may also change the default au3 double click action from edit to run.