Shader 2.0 support would come under the category of feature requests. Here's a repost of what I wrote before to give you a sense of how we approach these things:
Originally Posted by Jebrobins
Here's how post-ship game development works:
You spend a fair amount of time compiling issues, feature requests and optimizations. You then decide which of these you think are reasonable and possible to address. You then sit down with your development team and build a schedule for how to do this.
Then you get to go do the changes. Then the fun part comes: testing those changes over and over again to make sure they have no negative unintended consequences.