If I have a long-running query in one tab and switch to a different tab to do other work, I would like the non-active tab to visually show that it's still busy somehow. This way I can tell when it finishes and switch back to check the results.

The workaround is to open a new instance of LINQPad, but sometimes I have 2 or 3 long-running queries and would rather just stick with tabs if I could get them to communicate their 'still running' status even when inactive. :)