Hello, Most testcases are typically tied to some sort of requirements. It would be a really useful feature to have a 'requirements' tab next to the description tab. If there are rows in the this 'requirements' tab, I can list all my requirements that my testcase covers. I can also then programatically tie these requirements to testcases in Quality Center.
I think three columns are more than enough. At least for me there is typically some requirements number (e.g. Req# 4544.33) some title (e.g valid usernames) and sometimes a summary of the requirement (e.g. user names cannot contain special characters)