In POS2.0 you can not accumulating a lot of coin-days being offline.
Only online coins can accumulate.
At least with BC; I found it interesting that they were moving to SHA256 for POS 2.0 vs Scrypt. Not sure what the technical reasoning was behind this, but interesting none the less.
Scrypt [5] as its Proof-Of-Work; also being used as the
block hash.
However there are some issues with that previous
implementation. Using Scrypt offers no real advantage to
Proof-Of-Stake;
and is far slower than some alternatives. Since
BlackCoin is no longer in PoW phase, the only major change
would have to occur in the algorithm for determining the block
hash.
Therefore the block hash has been changed back to
SHA256d. To reflect this the block version has been increased
to version 7.
PS: From my experience Blackhalo is using SHA256d so i
speculate that scrypt have some limitations
to use multi sing technology. ( 2 factor authentication in clients - in Halo addresses have 2 dimensions )
or is just slower.