sorry this is nonsense. Does the keeper ever warn the batsman about stumping's. All cricketers know which part of the pitch is theirs and which isn't. My only issue is that there is a different rule for ODI's and other cricket. In the league I have batters 2 yards out of their crease before i release the ball. That's cheating, I'll run them out, bugger warning the cheats. Its either a Law or not.
No, but the keeper has outskilled the batsman, and thus won their individual competition.
At what point should a batsman back up out the crease?
Many batsman walk down in time with the bowlers action, if the bowler complete's his action but doesn't release the ball the batsman may have left the crease but not through trying to steal a run but because the time the bowler has gained from holding on to the ball the batsman has continued his forewards movement. I don't feel I've worded that brilliantly, someone else may do better.
If a batsman is blatantly out his crease trying to get a run then fine, but if they're backing up slowly/as we're taught as colts then for me it's the bowler trying to steal a wicket as he's admitting he can't beat the batsman otherwise.
I'm happy for Mankad'ing to be in the game, but I believe once the delivery stride is entered if the bowler doesn't bowl it should be dead ball. Once their backfoot has landed I don't think you should be able to be out mankad for the reason above.