I know a way to not offer any apps: go to Service Plans and select the plan you'd like to modify, head over to applications and tick the box that days "Provide only applications that I select". Select nothing and hit Update & Sync. Voila - no more applications to choose from.
The actual Applications Tab is still there though but applications can no longer be installed.
I have already gone with that option, but would prefer to remove the APPLICATIONS TAB completely.
Having the Tab visible, with no options just opens the door for clients to ask questions.