I am using LiteTouch (MDT 2010u1)

I have copied the Roles and Features panes posted on http://blogs.technet.com/b/deploymentguys/archive/2010/09/01/mdt-deployment-wizard-panes-for-installing-os-roles-and-features.aspx

I would like to only show the roles and features panes when a server task sequence is selected. What is the formatted of the conditional statement I need to set for them?

Could you not just use a Condition in your wizard:
Property("ISSERVER") = "True"   so it will only run when your are on a server?
Or would that not do it for you?