Limits in the Resource Governor with regard to temporary database usage continue to hold for the user-created temporary databases, just as they do for tempdb.
Large scale deallocation is not logged for temporary databases.
Replication Agent is never started for a temporary database.
The child threads for parallel queries are assigned to the same temporary database as their parent.
A multidatabase transaction that spans temporary and nontemporary databases cannot start in a temporary database, since it would be impossible to recover such a transaction. However, a multidatabase transaction across only temporary databases does not have this restriction since temporary databases are re-created each time the server is restarted.