100 set,
I believe once you have landed and the controller estimates you are "under control" and able to stop, they can assign you to hold short of an intersection, when they cannot issue a LAHSO clearance. At my last outfit, we did not have LAHSO in our Ops Specs, but they tried to do it all the time. A quick chat with our POI led to the following conclusion:
If any part of the airplane was still in the air, and we were instructed hold short of "X" we were to respond immediately with "unable." Once ON THE RUNWAY and applying the brakes, if we were certain we could stop in time, we could then OFFER to hold short of X, or accept (or for that matter still deny) instructions to hold short at that time. It's a technicality, but it is a technicality that bit another outfit when a guy "unknowingly" accepted a LAHSO clearance in a Part 135 C-206 (!) with 5,000+ (!!) of ALD. (Yep, some Fed was out flying that day and heard the guy do it, so he came over for a little chat and a violation.)