Yup, that would work. Maybe for unit test assemblies just add a (#) next to the test name with a count of the tests in that assembly.
For example:
Name,Code Coverage %,Compiled Lines,.....,Tests Executed
SomeAssembly,15.00%,27.0,.....,14
SomeAssemblyTests (14),100.00%,......
With this I can quickly determine if I have invalid tests (wrong location, old, not testing the correct code) and how many tests I have that actually touch an assembly. For example, if the "tests executed" column from above had more then the tests assembly that may be a code smell (too coupled, not adhering to Single responsibility, etc)
Thanks,
Jeff
Edit: Formatting didn't work so changed it to csv format