In Orion currently, you have the option to cycle through tabs in most recently used order when it comes to using the Ctrl+Tab feature. However, when you close a tab, you seem to be moved to the tab either to the left or the right of the tab you just closed (I have tried a few times but I can't come up with much of a rhyme or reason as to which one it ends up being). I'd love to see an option in the preferences so that when you close a tab, you're switched to the most recently used tab before that, and so on.