I guess we should read the owners manual more often. heres directly from the owners manual "Since this model is equipped with a self-canceling system, the turn singal lights will self-cancel after the vehicle has traveled both about 150m (490 ft) and for approximately 15 seconds."
good luck bypassing it. from the wiring diagram its wired into both the ecm and speedo sensor. well actually looking at the wiring diagram if you disconnect the white wire from the relay that may work. it looks like the white one is the control from the ecm not sure what it does with the relay id disconnect it and see what it did if that was bugging me.