Model for Cable Supporting Lateral Point Loads

I am performing analysis for a cable system as shown in the sketch below. The cable runs through holes in vertical posts, and is anchored at the same elevation as the base of the post.

   

I divided the horizontal section of the cable into two sections so I can place point loads at the node since point load within the span of the cable produces error messages. An initial tension of 5 kips was applied to the inclined cables. I calculated the horizontal component of the tension in the inclined cables and applied it to the horizontal cable. The "Cable Model" is attached.

  1. Is this the right way to model and analyze such a system in STAAD?
  2. Is breaking the cable into multiple segments the right way to apply point loads on cables?
  3. Is applying the horizontal component of the tension in the inclined cables to the horizontal cable the right way or do I need to apply the same 5 kips tension to all the cables?
  4. Do I need to include the "Factors for Advanced Nonlinear Cable Analysis" if there is no any other distributed load on the cable beside its self weight? The Member Specification dialogue calls it "additional weight" but the description in the help docs is not that clear. The self weight of the cable is already included in the DL load case.
  5. I defined a load case with with no load value/distributed load of magnitude zero in it and applied it to another model ("Random Model", also attached). This load case produced reactions and deflections which are equal to the values obtained for the self weight case: does this mean the self weight of the cable is automatically added to every load case?

  

Cable Model.STD   Random Model.STD