Version 2.4 is here.

Updates:
I continue to experiment with Pivot window and looks like I found nice solution, this is how it looks now:



I made the settings that you will use most of all the bigger button and small that you will use very rare.
Also I tried to make Orientation and Position to look visually different, to help you distinguish them.

Behavior:
When you go to the object mode(F1) Position and Orientation will set to Object.
When you go to subobject mode from object mode or spline (1,2,3) Position will set to selection and Orientation will set to World.
When you go to manual mode(F2) Position and Orientation will set to Manual.

Shortcuts:
(F1) Set Position and Selection to World. Also Set Object Pivot.
(F2) Set Position and Selection to Manual. Also Set Manual Pivot.
(F3)* (New Shortcut) Drop Pivot, i.e. set Position to Selection and Orientation to World.

Also you can click RMB to set both Position and Orientation at the same time.

I tested this scheme looks nice, I hope it will make you work with Pivot in the Most comfortable way ever!
Also I hope you will use this window very rare because a lot of things now automated for the best use.
Other stuff you can read in Tool Tips.


Some modification was made with lightning.

Download:
www.nvil.info