I'd figured he'd work out that kink as you stretch him out.
I do know he won't move when you tell him to stay, even when other dogs are running around.
Cutting the corner of the pond is a good thought. did you have any luck finding a description of swim-by? There should be some good descriptions and discussions on here.
I have to spend some time on the tractor this weekend, but if I get some time, maybe we can meet up for a bit.