Status-bar PER tab
It is often quite hard to know that an update or insert statement, or DDL statement has actually happened. Data from a previous SELECT statement remains steadily there, and the only hint is to watch the right-hand corner and actually see this change from Ready to Executing to Ready - but if you miss that, even the Output window is not definitive. A status bar PER TAB - like Management Studio - including the last number of rows affected, the last execution duration IN THAT TAB, etc. would be immensely helpful.
This feature is implemented in the new version 4.0 of dbForge Studio for SQL Server http://www.devart.com/dbforge/sql/studio/download.html