This new functionality is not mentioned in history txt, but CtrlArrow=0 is mentioned in the HelpOK, I will handle Shift+Cursor left/right myself too (ignore the displayed cursor position and use my own).
Btw, if you dislike the handling of Ctrl1Shift+Arrow, you can disable it via wincmd.ini, [Configuration]
CtrlArrow=0
With CtrlArrow=1 it almost works as with CtrlArrow=1 (except for the extended stop-character set of course).
But when selecting to the left where there is initially nothing selected, then with CtrlArrow=0 I can see the blinking cursor at the left side of the selection when I use Shift+leftarrow or Shift+Ctrl+leftArrow or - with CtrlArrow=1 the blinking cursor stays at the right side of the selection (which it shouldn't) when using Shift+leftArrow or Shift+Ctrl+leftArrow. (use the example in the first post) - Anyway when pressing left or right after having selected with Shift+leftarrow or Shift+Ctrl+leftArrow the cursor jumps to the expected position, which it did not in TC 11.00b1.
Using Shift+rightArrow and Shift+Ctrl+rightArrow works as expected.