Can I add the weight of passengers in the Fuel and Payload window, then?
If you mean in the updated ACE. I guess the answer is yes. I can't see Captain Sim relasing an update of the ACE if it hasn't been improved or completed.

@Edwin. The 727-100F holds 8 ULDs and the 727-200F holds 12 ULDs. All you do to fnd out, is load them until there is no room for any more. ;)

Mark