How to fork an Altcoin Which has 0 Reward Block to continue mining after the LAST POW BLOCK
I don't know ,if you created the coin ,it will be very easy for u to extend the pos margin block area(those pow blocks:>)You not only need to differ the blocks when CreateNewBlock by nBestBlockHeight but also need to do some modifies in "getblock" message blocktype checking.
That's all i got ; If this helps please tip me some reputations guys,this new "50 reputation" for comments nearly silent me  .