I recommend the free program Notepad++ for coding in ChoiceScript (available here.). It doesn’t do automatic quote fixing or any of the other annoying things you might get from Microsoft Word. Among other features, it allows you to select whole chunks of code and indent or de-indent them by hitting Tab, and @CJW helpfully created a syntax highlighter for it in this thread.
(I also use Notepad++ for Lua and C. It’s really useful!)