I got around to submit a product suggestion to Microsoft (for SQL Server 2005).
I loved the shortcut to 'Manage Indexes' from the query plan to create some temporary indexes for performance testing. It was a very handy feature that made performance tuning a bit easier. I've submitted a suggestion here (go vote!)
I'm also following 2 other suggestions. One being the complete 'Script As' script with DROP and CREATE statements, check it out here.
Finally there is the very unhandy 'feature' of not being able to load scripts in the current connection and database context, check it out here.
It seems I'm a bit conservative and want isqlw features back :-)