When you say control over the options, what exactly do you mean?
As far as I can see, each user can control the positioning of elements on-screen by dragging and dropping things around.
You can control the access to elements of server by setting the users package.
You can also add/remove icons and thus features by using the feature sets.
It is also possible to brand the x3 header and a wide variety of icons and panels using your branding options under WHM.
If there is something else you were thinking of with respect to control, perhaps there is a way we can help you
