My roommate (who has only been canyoneering once, but has a wealth of knowledge and experience with ropes and knots) and I were playing around with this today, talking about how this could be problematic in a tight area where there is some risk of the stick getting bumped. So my roommate looked at it and said, "why don't you just tie a slipknot on the other end?" So we tried it, and it worked great. We used a double slipknot to make sure the rope was big enough. I tried tugging on the stick, and it does not come through the other end. Then we tried pulling the rope, and it didn't seem to complicate the pull much, if at all. Stick came out super easy. This accomplishes a similar thing as moab mark's pin. I don't know that it would be useful in all situations, and I need to experiment some more, but it seems like something useful to consider.
Attachment 57858Attachment 57859
[And no, the stick is not ideal, but it's what we had laying around and was good for what we were testing.]