I've never seen front of the line passes at Disneyland, only Universal. Fast passes for RSR have been gone pretty quickly, usually by 9:30 give or take.
What kind of pass are you referring to? I think others have said that the attraction re-admittance passes are saying not valid on RSR. The regular FPs are running out by 9:30am or thereabouts.
The re-admit tickets that are out now will say not valid for RSR so no, you cannot use a pass like this for RSR.
DLR does not offer FotL passes, only FP or a GAC if you have a handicap that qualifies, but a GAC does not offer FotL access.