Michael Niehaus has an updated post regarding modifying the LTI wizard to show a different list of applications based on which Task Sequence is selected.
A few years back, I posted a blog at http://blogs.technet.com/b/mniehaus/archive/2010/06/11/selection-profiles-with-the-lite-touch-deployment-wizard.aspx describing how to modify the Lite Touch wizard so that the deployment wizard shows a different list of applications based on the task sequence that was selected. This worked fine with MDT 2010 Update 1, but there have been a few changes to the scripts and the structure since then. So how do you need to do it now? Well, it hasn’t changed much, but just enough to break things.