I created an auto-completion file for ACS to work alongside the syntax highlighting. I created a new thread here: viewtopic.php?f=37&t=69425
Added the link to the opening post.
In case people don't follow the development on GitHub: I updated the DECORATE highligher to bring it in-line with the others in relation to the color schemes (I discovered that the TexPad one was out-of-date even more than the Notepad++ one).
Keyword-wise, though, it remains outdated.