Shelving tabs is such a great feature that I now take it for granted in things like Notepad++, Redgate SQL Prompt, and of course LINQpad 6+. It would be fantastic to backport that feature in LINQPad 5 for the many of us stuck on .NET Framework for one reason or another.

I understand LINQPad 5 can't get all the latest and greatest, but I would consider this a foundational feature for a scratch pad-type app where you want to get in, test some code, and get out quickly without wasting time thinking about files.