The same question has been asked for Xcode 3 But the solution there is said to not work with Xcode4. And no new solution is available there.
How to get a key-binding to
Complementing courteous answer, I added two more commands:
Move Up 10 Extending Selection
, with the value moveUpAndModifySelection:, moveUpAndModifySelection:, moveUpAndModifySelection:, moveUpAndModifySelection:, moveUpAndModifySelection:, moveUpAndModifySelection:, moveUpAndModifySelection:, moveUpAndModifySelection:, moveUpAndModifySelection:, moveUpAndModifySelection:
and Move Down 10 Extending Selection
, with the value moveDownAndModifySelection:, moveDownAndModifySelection:, moveDownAndModifySelection:, moveDownAndModifySelection:, moveDownAndModifySelection:, moveDownAndModifySelection:, moveDownAndModifySelection:, moveDownAndModifySelection:, moveDownAndModifySelection:, moveDownAndModifySelection:
then assigned the shortcut in XCode: