I would also add a USD/BTS colletaral ratio function based on amount so it would be less possible to get these kind of big margin calls.Means as higher the amount of collateral as higher the ratio to lower the risk to get margin called.
Bitcraps margin call was a good example how his margin call sucked out all the bitUSD from the market.
Each and every coin was at least 10% cheaper than on other exchanges.And there was no possibility and liquidity to get funds
from external exchanges to buy these margin calls without loosing money.
Since Margin Call was offered 10% under settlement price and all coins had already a 10% lower price than on external exchanges there was no way to transfer liquidity to DEX without making a loss on that trading.
So the main intention to get the margin call quickly eaten by a lower price of 10% is only valid for margin calls to a certain seize.
DEX has till today a lack of liquidity of bitUSD which you can see that most coins are still 5% cheaper than on external exchanges.

I also agree that only the amount of BTS should be offered for sale on a margin call which is enought to get all colletreal back to minimal Ratio + 0.xx

Hi i'm a member of CVCOIN which is running on Bitshares Network.
Our core group is trying now to create more awareness for that coin since Beta is coming out and we will join 2 big exchanges soon.
We noticed that CVCOIN is not being listed on the mainpage of Bitshares Asset Exchange but only can be found via search tab.
I guess thats the reason why the volume from that website is nearly zero.
Since there are many coins listed with zero volume i would like to ask if its possible to add CVCOIN to the mainpage for BTS,BitUSD and OPEN.BTC to increase the awareness of that coin.
If there is a progress how to accomplish it please let us know as we are highly interrested to grow together with Bitshares on TOP.

Regards Thul3