The updated Bitstamp app for Hive is done and available at https://github.com/tgerring/hiveapp-bitstamptrader/releases. All the standard trading/transfer functionality works (no more copy/pasting deposit addresses!), though it could still use a little polish here and there. If you're interested in developing an app for Hive Wallet, the code behind this is simple HTML/jQuery and makes use of several parts of the Hive API.

This will (eventually) be bundled with the app in subsequent builds. Here's a screenshot preview: