the rule should guarentee two thing:
1. if I want to buy bitCNY, I can buy it at price 1.0 + premium
2. if I want to sell bitCNY, I can sell it at price 1.0 - premium
and the premium should not too small, my suggest is more than 2%
then market maker will give a better offer, with more small premium
then we can buy/sell bitCNY at price 1.0 with small premium from the free wallet market.
force settlement is a way to guarentee you can sell bitCNY at a floor price, so I think the price should set to * (1.0 - premium) CNY/bitCNY
when the price of BTS is 0.02 CNY/BTS, witness should set settlement price to 0.02 / (1.0 - premium)
on the other hand, force settlement will hurt shorters, because this force them sell BTS even when they have enough collatereal.
so we should not encourage people use this, we can set the premium to 2% or more, as compensate for the one be settled.
for all witness, if you approve my point, you can change the parameter at xeroc's price scripts
set discount to 1.02
to avoid add aditional fee for bitCNY, you should change core_exchange_factor to 1.02 too
and set SQP more than 1020
and I want to tell again, let witness just input feed price, which is the real price from exchange
let commitee adust SQP, settlement price