Encore does not support "link to loop point". I have been requesting this feature since Encore first came out. Please submit this feature request to Adobe...
http://www.adobe.com/cfusion/mmform/index.cfm?name=wishform
As a work around you can create a second version of your menu that does not have the intro. You would then link your assets to this second menu.
Greg Mulvey
Designer:Animator
http://www.gregmulvey.com