It's a very neat idea. I remember being totally addicted to dragging cloth around while pinning vertices to animatable objects. In fact, I think it was an official R'osity tutorial that brought it to my attention.

Poser sure has some seriously cool animation tech under the hood, it's just a shame the animation interface presented to the animator, is so old and clunky. One of the most powerful aspects of Poser's animation tools is the system Nerd developed. Not sure how many people realise it but it's power goes way beyond controlling a morph by a joint rotation. I remember messing around with all sorts of stuff, like controlling the brightness of a light depending on the bending of a knee, and even attaching a micro-sequence, all spline interpolated and independently sequenced, to a joint and having the bone rotation drive multiple other elements in the scene, depending on the angle of the bone rotation.

Crazy powerful stuff (just update the animation interface please, Bondware).