yeah, i wouldn't recommend using cat5 and quick disconnects. the act of pulling the connector off tends to break the wire. when you solder the wire in place it is pretty much on for good so there is no problem. i use it for wiring my cps since once it's done there is little need for any changes, it's very condusive to wire managment, and i have a whole box of it left over from when i wired my house(and two friends houses).
i usually use normal stranded primary or speaker wire for situations that call for disconnects.
you could try stranded cat5, it should handle bending better. to be honest tho, once you get to such a thin guage of wire, it's just not very rugged.