I am successfully using
[myTable editColumn:aColumn row:aRow withEvent:nil select:NO];
to move to a different table cell and start editing it.
The problem is that the text is always selected, irrespective of the select:
parameter. If the user isn't careful the pre-existing text is lost on the next key press. No problem navigating cells with the mouse.
The table is view-based, the cells are populated with a vanilla NSTextField, the content is bound via an NSArrayController to a local array, not Core Data.
Make this your next statement:
[_window.firstResponder performSelector:@selector(moveRight:)];
_window
is your controller's window or whatever. Use moveLeft:
if you prefer.