No Regression Test coverage

I've found labels to be a convenient way of filtering test cases for this purpose.  You can thereby mark some cases in this way and report on their execution status.  Dashboard gadgets would work particularly well in this case as they can display % or number stats.

Perhaps another way that might help is to contain your regression tests in a separate cycle and that way you can run and re-run those when you need to and exclude/include the results as you need.