how to remove collision of parts of the euphoria ragdoll models?

[Pinchamadre]

in x64a.rpf there is some yft models called z_z_fred.yft and z_z_wilma.yft which when you view it and click on bounds there will be the euphoria ragdoll. i wanted to remove the collision of the legs so they could walk sideways. how can i do that? is there no way to do that?