Thanks for the suggestion! Actually Ctrl+Tab does just that. Or would you like to have the option to swap the behavior of Tab and Ctrl+Tab?

See comments.

Great, thanks!

Thanks, 4Cn!
About the colors, you might want to vote here:
http://roadmap.cintanotes.com/topic/90807-arbitrary-colored-text/

As for the "other editors" option, could you please also add it as a separate suggestion? Thanks!

Hi 4Cn! Thanks for the suggestions, but please keep it one suggestion per entry.
Could you please repost as separate entries, like this:
    Viewing unprintable characters in editor
    Scrolling past last line in editor

Syntax highlighting support is already registered, please vote:
http://roadmap.cintanotes.com/topic/3228-source-code-syntax-highlighting/
Thanks!