Has anybody else figured a way around not being able to use spaces in design options for Revit MEP 2011?  The whole design option thing works great for architecture by allowing you to use rooms in each of the options but when you get to mep it will only allow spaces on the "main model" and not include them in options.  If this is the case, design options do not work in mep at all.  Any suggestions?  Thanks in advance.