first of all I have to say very big thank you to Christian on his work and this very enriched 6.0 release. Thumbs up! =!
it should be a hand with a thumb

I would like to point out something that pretty annoyes me during working with the new directory tabs: evidently, the navigation history stays common to all tabs (as it was prior to their introduction, that is only one history per side). Thus of course while moving back and forth (alt+<-, alt+->) the directory changes regardless of the tab I'm currently at, even if after creating it I navigated nowhere from its current directory.
I think that the history has to be local to the tabs and each tab will have its own list of visited paths - much like in a web browser. Perhaps there should be a check box in the tabs configuration dialog, allowing the user to merge histories of all tabs on a particular side but the default behaviour has to be distinct lists remembered.