We do not think we're going to do this functionality as a general roll out. We ourselves have taken on PC vs NPC sheets, and with our next update we'll be adding the originally mentioned Dungeon World sheet and a GUMSHOE sheet that utilizes various subgames. We think us taking on the licensing is the best decision for this area. We've had a lot of sheet contributors feel obligated to provide ongoing support in a way that we as Roll20 did not intend, and so an ongoing goal of ours will be supporting more major systems down the road.