This is an awesome looking tool so far and it has a lot of support for a lot of files. However, I'm saddened by the fact that it doesn't support .ca, .ma, and .md files. These work similarly to .nsbmd and .nsbca files (I don't know about the .ma files, unfortunately).
I used your doc (I do think it's yours) here--http://llref.emutalk.net/docs/?file=xml/bmd0.xml#xml-doc and dissected the header of a file ripped from Fire Emblem 12, a game I'm currently translating. I need to translate the logo and the opening which use the aforementioned file formats; however, no program supports them despite the format of the .md file being so similar to the .nsbmd file. If you could somehow give support for these files, I would appreciate it very much.
I actually made a post asking for help but did not get anything so I continued to research even harder and found myself here. Here is the link to the post
which includes screenshots and downloads for files of the file types I mentioned, as they may prove useful.
If you could at least give any information on how I might edit them, it would be greatly appreciated. Regardless of whether you're able to help or not, your work is very well done, and I hope you continue to make progress in your endeavors. ^_^