This is a very pretty editor. That said, I have no freaking idea what I'm supposed to do. I've been messing around with it for around 15 minutes now, and I still don't understand it. I added a PHP website folder and got no code hinting or anything else beyond "here is the match for your parenthesis" for either PHP or Javascript. This also resulted in my "navigate" tab being filled with SVN meta-files. I am quite conf…
At the very least you should record screencasts of you using LT to build LT with you talking people through what you are doing.
I really want to give this a shot, but it needs to be easy to get started.
Besides your feature and bug backlog, I would map out the user journey (i.e. create an experience map) for LT to discover all the pain and frustration points people may have with using LT.