Guys BTER has been doing a great job. Yes, they are centralized. But bitshares x still has some issues with the software and I think they are doing the right thing limiting the amount.
One thing I may suggest however is this: limit the amount per withdrawal but not the TOTAL amount per day. I.e. To be safe keep limit of 5,000 BTSX per transaction. But make daily limit 500,000 or something