I asked my brother in Ely, a "lifer" in the USFS, why people should use the latrines in the BW while the bears don't have to.  His answer; Because bears don't eat "people food".   ;D  ;D

Hopefully this bear also grabbed some TP and a shovel and headed up the hill.

My solution - if bears are apparently now relying on the sight of a hanging pack between trees, and have evolved to enough to complete mathematical formulas (people + shore = lunch) start hanging a pack of rocks and put your food in the tent.   Hang the pack low enough for the bear to get it and when the bear is under the pack, cut the rope and the pack of rocks falls on him and crushes him - now who's got the food! ;D

Sorry, I just had to make light of this.  I haven't hung or hid a food pack since 1992.  I have had bears in the campsite before but between my canoe paddle and some rocks, they never hung around for long.

However, db, if I was ambitious (and less cynical), I would implement your system.  Seriously.