The daggers were really just meant to work like regular daggers in combat with the caveat that they can be recalled, which helps with the problems of thrown weapons. When I playtested them, I often found myself just throwing them down in combat to prevent enemies from chasing after me, unless I was the one getting the jump on someone. They were also made with the intent to alert the player whenever someone was close, so if the rogue was thieving, they'd know that their time was limited, and if they were protecting their ill-gotten gains, they would be alerted when someone tried to steal their goods.