What if I wanted to look through all the Rails sources when I did a command-P or similar? How can I add a folder to the domain, without necessarily opening it or adding it to the left gutter? THanks!

SublimeCodeIntel should do what you’re asking, but I haven’t been able to get it set up. http://www.sublimetext.com/forum/images/icons/smile/redface.gif Others can help if you need it.

It’s not possible, the folders on the left are exactly the folders that that Goto Anything searches through.