Spent a fun day building a fast rectangle extension tool to beat that age old NT7 problem into the ground.
rfkExtendRects is built from the ground up using low level graphics and event access, is fast and easy to use, takes its settings automatically from the selected rectangle, extends rectangles infinitely to the right, offers persistent storage and handles global draw objects. Chart-local extensions move with any move or resize of the original rectangle, global objects need to be re-clicked for now. Pondering an attack on that one, but it's ultra fast to do anyway.
No buttons, just Ctrl-mouse-left-click in the middle of any rectangle or Ctrl-E with mouse over any rectangle to toggle its extend state.
Only two parameters, a (unique please) ChartName string if persistent storage is wanted, and a right hand pixel margin if required (e.g. if want to avoid RH profiles overlap.)
I'm starting this thread for usual support requests and bugfix feedback, will put the initial Beta zip archive in the next Summary post.