On concepts and realities
Great.  But please don't take too much notice of feedback at this stage, it's more likely to distract* you from your core goals.Focus on expanding the concept, listen to a small group of critical people you can trust for feedback and you'll build the tool we're all supporting you to build :)As an aside: to truly 'fix' files, you need to 'fix' version control.  That's out of scope for Light Table, but it's something that could be addressed by a parallel project (if someone else fancies looking at it).* i.e. complicating things so you can support Java/C# - few of those devs will ever use Light Table, and if the concept is a hit then you'll have Microsoft and Oracle waving big wads of cash at you to support their platforms.