This is probably not what you are looking for exactly, but Sonic has a program called Scenarist Publisher.
http://www.sonic.com/products/professional/ScenaristPublisher/quicklook.asp...
I have used a demo and have to say it is very possible to cut down on authoring times. Basically you create a template form. Then whenever you do your video and audio encoding you just switch out the assets and multiplex and you are done. There are many many other possibilities that could improve your work flow enormously using this program. Go ahead and check it out.
-Luke
