Tinkering? Well eh NO, I installed it played with it released it and watched it being bEautIfull.
But you are right it does keep the last selected tab open.
A few days after I installed FCKeditor and got a scare, 'cause my tabs were gone in admin.
Klick on show source and they were back, so even that works.
Great contrib can't say anything less.
Walter
www dot voordeel4u dot nl look for Finlux