Quick/favourite Connections
A popup that list recently used/pinned servers-database
allowing for 1-click switch to that database while writing your query.
A shortcut key for this would be appreciated.
The Current default SSMS behaviour > Select a server then select a database then continue working. sometimes ones default database is set to master/orsomedb which is inconveinient and always has to switch.

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Алексей Левчук commented
After SSMSBoost became a paid application this feature is must-have for the SQLComplete! This is a killer feature, once you taste it - you will never look back =) Please, Devart, make it happen for al of us, multiserver/multidatabase folks.