BlockTrades has made some improvements to the withdrawal/deposit functionality for the BitShares GUI wallet (several specifically for Steem users):

BlockTrades has now enabled “fast-confirmations” for all cryptocurrencies, so you can send in bitcoin and get your Steem or other cryptocurrency purchase in about 20 seconds on average. This feature was primarily added to allow merchants to provide their customers with a way to rapidly pay for items in shops and restaurants using point-of-sales systems like BlockPay, but it can also be useful for regular BlockTrades customers who wish to make rapid purchases with Bitcoin, Litecoin, and other cryptocurrencies that don't normally confirm quickly. Many users probably won't take advantage of this capability, since it does require some initial setup and a surety deposit, but it may be of interest for active traders who want to capitalize on rapid price changes.

The user's browser now keeps a local cache of previous withdrawal addresses for each withdrawal wallet type to make it easier to make repeated withdrawals to the same destination. The withdrawal address defaults to the last withdrawal address used for that withdrawal wallet type and a drop-down can be used to select from previously used withdrawal addresses.
The wallet GUI directly queries for supported coin types from the OpenLedger API server, which enables addition of new coin types without requiring new updates to the wallet GUI code. This will make it easier and quicker for OpenLedger to add new coins to their gateway.
Memos can be added when withdrawing to a wallet type that supports memos (e.g. graphene-based chains such as MUSE and STEEM). This is particularly useful when you want to send Steem, Steem Dollars, or Muse from your BitShares wallet directly to an exchange that supports these coin types, because they require a memo to be included to credit a deposit properly. To encrypt the memo on a Steem withdrawal, place a # symbol in front of the memo. It's also possible to add a memo when depositing from a graphene-based chain. For example, to receive a memo with your OPEN.STEEM, send from your Steem wallet with a memo like “open.steem:my_bitshares_account_name:my_memo_text”.
If you withdraw using the memo method to a Steem wallet, you can include an encrypted memo as follows: “steem:my_steem_account_name:#my_memo_text”.
The GUI will fall back to a backup server for withdrawals/deposit API calls if the primary server is not reachable.
Coin names are displayed alphabetically in the deposit/withdrawal drop-down lists.

The changes are live now on OpenLedger, although you made need to press F5 to refresh your browser in order to see them: https://bitshares.openledger.info/#/