Getting Sophos SUM, Message Relay and RMS to appear in Windows Ad/Remove programs?

We are trying to configure about 150 Windows 7 Pro/64 machines to become additional Sophos Update Managers - we want to have one SUM at each branch office to reduce traffic across the WAN.

We relied upon information in Sophos KB Article 61474.  Specifically, that article indicates that the flag “ARPSYSTEMCOMPONENT=1” causes the components installed to appear in Windows’’’’ Add/Remove Programs applet.  Further, the article indicates that omitting the flag cases the installation to revert to the default, which is ALSO for the components to appear in Windows' Add/Remove Programs applet.

None of these options actually work for us.  It doesn’’’’t matter how we have ARPSYSTEMCOMPONENT set or even if the flag exists – the behavior is always the same: the Sophos components do not appear in Add/Remove Programs.

Here's the Question:

How do we get the SUM, Message Relay, RMS, etc. to appear in Add/Remove programs?

Thanks!

Ken Morley