Jim has been around in the pipe drumming world for some time. Very cool man and he knows his stuff extremely well. As far as getting the two finger roll down, practice is slow but with pretty good stick heights. That way when you do it faster you have some room for your heights to come down for the speed.
And not to make it sound worse but when he speeds up he isn't doing the momma-dadda roll anymore. He switched to a paradiddle sticking. Its an edit in the video that makes you think he is still doing the RRLL sticking but there is a few minutes cut out where he switched to a RLRRLRLL sticking.
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1987 Colts Snare
1988-89 Cavaliers Snare
1991-1992 Railmen Instructor/Caption Head
1994-2000 Waco HS Instructor/ Caption Head
2003-2008 Jamestown HS Caption Head
Professor of Percussion, Christopher Newport University