I would love to see a LRB icon for the LRB songs. Still waiting to see a AC/DC icon and category too. Also think the 20 free DLC should be considered RB2. Yes I have a lot of opinions on this lol.
Anyway, I think the reason why LRB is not seperated is because RB2 hasn't been programmed yet to see it as seperate. This is something that would need to be fixed with a patch.