Why not just play on the latest, since they are technically the same game? I won't fault you for wanting to play 0.8.1, but i am somewhat curious as well.
Theres no denying that there are differences between these versions. I was wondering why you would want to run 0.8.1 particularly so.
Keeping track of multiple versions sounds like it would be pretty hard. But this is the mods decision to make.