Hi,
I have two suggestions for the structure tree (they may already have been suggested):
1. The "Environment" tab could recognize *all* \begin...\end structures, not just equation/figure/header/etc. I often need to define my own environments and it would be great to see them here!
2. The project system should recognize files included by commands other than \input and \include. For example, I'm using the "import" package in a project to mediate my nested directory structure for the project, but TXC doesn't pick up any files included by \import or \subimport, which makes the project system essentially helpless for this project.
Thanks developers for your hard work! It keeps getting better and better!