Thanks joele, thanks xeroc.
xeroc, in the thread link you provided, BM refers to the storage of transaction fees as a reserve that can then be used to cover shorts should they ever be closed with inadequate collateral to buy back the bitUSD. Further if that is insufficient, the reserve would go negative to make up the difference, and then get credited back as transaction fees keep getting paid to it. This implies that the short bitUSD would be fully covered one way or the other.
Its the first I've read of this...do you know if this is how things are currently implemented? Or was that just a proposal that has since been superseded?