Still working on improvements. The OpenType Features Editor is a free Windows application to help with OpenType font development. Check it out here and let me know what you think.
Hey, do you think it'll work also with complex Indian scripts such as Devanagari, Malayalam or Bengali too?
Well, it won't blow up or anything, but I don't think it will provide any useful feature generation, either. If you could send me some sample *.afm and *.fea files, I would be happy to add support.