SSPM Wall and Slab Connection and Releases

Is there a way to control releases between the wall and slab in the physical modeler? 

I'm trying to model a wall that is supported by a slab, but I do not want the wall to stiffen the slab. Can I release the connection between the two elements?

I suppose my question also applies to the slab that is supported by a wall. Can I adjust whether those nodes are rigidly connected vs pin connected?