I need to know how to input point loads.  I have two types of point loads that I need to include in my calculations. 
3a) The first are dead loads such as PV or solar hot water panels or other equipment mounted on a roof.  How can I include these types of loads in my calculations?
3b) The second type of point load that I need to include in my calculations are for a client who is a quadriplegic and moves through his home in a 500 pound motorized wheelchair.  How can I include this type of moving point load in my calculations?. I assume that I would place the point movable point load at the center of the span.  How do input this type of load?