I am not sure if this would work, give it a try. There is a configuration that can be set for FCK Editor to list the toolbar set. But, this again cannot be done for specific users. This could be a start to explore similar options. Will post if I get something better.
Thanks for replying. I am able to show hide items of toolbar (This is configurable in SiteStudio, element definition) but it becomes applicable for all users.
I want this configuration ti be dynamic so that i can selectiely show hide - Source button.
Have you explored the custom configuration scripts. Ref - Working With Scripts and Forms
Try to explore this sample provided and any other sample and try to see what area of editor can you configure.
ss_fck_simple_command.js - This sample script is an example of a simple FCKeditor command. This particular example implements an FCKeditor command, toolbar button, and menu item
Also, write to FCKEditor forums.