Custom templates organization

[Admin]

Well, not exactly what you are looking for but I'm telling you anyway.
I have a hack called Template Backup System, it's released.
When you go to the export screen, you can see a list of all templates - original edited and custom - grouped under the normal groups with an easy interface to collapse/expand them.
Install it, and use it to browse your templates (it has [edit] and all the other links in there).

Hope this helps.