Hmm I played around with that idea several months ago but experienced the same "inaccurate aim" you had when you parented one player to another so I gave up. Don't know how stable this plugin would be cause I thought you weren't supposed to parent prop_physics to each other. Like one time I had teleporters parented to my back (flag) and eventually weird stuff would start happening with the player's ragdolls (falling through the map
).