(They just added the shell mode back again
Ah, don't worry. You wouldn't need to test a specific feature to the limit. It's more using the software as you usually would, and identify things that are really a pain in the ass, that would keep you from using the new version (there are currently lots of those). Wouldn't it be good if a bug that annoys you could be fixed, because you found it, and then you don't need to work around it anymore?
(How can I seduce you to test, when the test phase begins?)