Find myself often working on multiple .hype files, each in it's own window. Might be nice if you used the same window with document tabs below the toolbar (like photoshop).
Ah never mind, I see there are tabs using this space already for different coding
Correct, the tabs are used for a different purpose... and we also try to stay close to standard OS X user interface conventions. (not to say tabs aren't one, but Apple's document-based apps do not use them).