Not sure about this… in the first version the tag pane will most likely be alongside file pane and bookmark pane, for simplicity and consistency. Although I really like the idea of being able to dock panes anywhere (left, right, bottom…). That would allow you to basically create your own workspace. So cool.
Yep, definitely!
Not sure how is this different from No.3… Mind explaining some more?
Again not 100% sure what you mean by weighted tags. Would really appreciate some explanation on how it would work out!