When modeling braced frames on structures with sloping roofs, you are forced to model the diaphragm at one level without slope for proper lateral load application; this causes the brace geometry to be wrong.  It would be nice to be able to model the proper brace geometry by using a lower level to represent the top of the brace and then slave the nodes at the top of the shorter braces to the nodes at the diaphragm level above them.  The assign diaphragm connection to node does not work for nodes at different levels and also only applies with rigid diaphragms.  This would allow proper brace geometry and brace stiffness when checking buildings with sloping diaphragms.