It would be great to have a way to update any aspect of a solution that was deployed.
For example I could have a solution that is hosted for a client and if we had a development server with an exact copy of the their database then, as long as no schema was changed in their hosted copy, then all the changes we make in our development copy could get rolled into an update.
Then all we would do is apply that update and it would output a log as to all the things it did.
Bouns points if we could also lock some tables so that developers cold control that data in those tables during the update.
This is huge a MIUST for anyone who had a hosted solution or for anyone who builds a vertical market product.