It should be great to be able to define usecase and to have the possibility to link them to requirements. This imply to be able to link each line of the use case step with requirements and then calculate the coverage % of each. This might avoid some regreatable missing features.
Let us us this information here for the template:
http://alistair.cockburn.us/Basic+use+case+template
The organisation should be able to define a different template (which really is a set of headings with comments).