Exclude objects from any Light ( Sun & artificial light )

Ideas & Requests
1

Hi
it is very good option to give me choice to exclude any object from any Light i use … specially Sun … to use any custom Background

Hope to get this option in D5 soon … thanks

image

or give me option for 1 side render to make background inside D5 is 1 side to pass light through and render it normally with scene

2

Sometimes I just want to exclude objects from casting a shadow.