The expression Condition rules limited to 5?

          However when we try to add conditions for formatting I cannot add more than 5 Conditions? How can this be overcome? 

          You can overcome this by changing your last condition to "The expression" and use "and" or "or" as needed to create your compound condition.

So, for example,

xdUser:get-UserName() != "" and xdUser:get-UserName() != "" and xdUser:get-UserName() != ""

     then change the first drop down to "The expression" -- whatever your condition was will auto populate into the box for the expression.