Inactivated Test Cases still appear in Test set.

Why is it that inactivated test cases are not bypassed when executing a test set?
One of my colleagues wants to keep a test case (in stead of deleting it), only not have it executed during her current test cycle.

But she can't avoid it in the test set, and the inactivated test case also will appear on the owner's My Page (marked with N/A, but still with the link to execution).