Comment 3 for bug 273531

Upstream developer on gnome bugzilla says it is a Ubuntu problem that should be handled as such:

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Comment #2 from Jens Granseuer (gnome-control-center developer, points: 22) 2008-09-23 16:09 UTC

The UI library doesn't know which widgets you hide/remove/add, so while it's
possible to check for conflicts there you can never be sure whether it really
is a problem.

In this particular case, the touchpad tab doesn't even exist in the upstream
version. This is a Ubuntu problem.