I just noticed this:

"VSLua, developed by Trango InteractiveŽ, is a complete solution for the Lua scripting language integrated within Visual Studio, the premier IDE for developers. It provides all the features within the Visual Studio IDE, that have become a requirement for any language these days. Features include a full-fledged editor within Visual Studio complete with syntax hi-lighting and intellisense. Complete Visual SourceSafe integration for Lua files (customizable by user), and a complete embedded debugger within Visual Studio."

http://www.itrango.com/vslua/index.html

Might be worth looking into for those of us that us DeveloperStudio alot I haven't tried it, so I'm not sure it gives more benefits than using a smaller editor with lua syntax highlighting.