Either in the Test Runs & Results or Todo tab it would be useful to have the ability to see what user(s) are assigned to a specific Test Run. I realize there may be multiple people associated with a single test run. In my use of TestRail there are usually only 1 or 2 people associated with a test run. Rather than drill into and pop out of specific test runs to identify who is working on what, it would be nice to have the assignee information at the test run level. I should probably mention that I do use both Test Suites and Test Cases.
I can see a couple possible ways to deal with not wanting to display multiple users; the simplest might be to show the top 2/3 based on number of test cases in that run.