UPDATE: This is now done. Take a look at here and here.
2. Katie Terminal:
Having a little extra line (maybe under URL/Search box) where you can type commands and the results be shown as a pop up dialog or a line at the bottom of screen (like K3).
Seems pretty tough if possible at all!
Or even nicer would be to just add another option as "Terminal" at right side of the main text box (along with Wikipedia, Dictionary, ...) Or a KT java app that simulates a terminal.
EDIT: Seems I proposed to reinvent the wheel! There already is a solution for this (AjaxTerm) in
this thread but it doesn't work for KT (at least I couldn't!).