Yes, there are a few. I should have said all the extensions underway should be finished - I don't suppose SWT want to be setting up temporary SDO at extra places for a few weeks.
I don't think there's actually anything to set up, it would be more a case of not changing (by re-programming) what's already there. AIUI from a description of the system (given in Rail Engineer magazine a couple of years ago), every SWT station (apart from on DMU only routes) is fitted with ASDO beacons for the existing trains; and the type of ASDO in use is full time, for example an 8 car 450 entering Reading will still read the ASDO beacons - as would a 10 or 12 car train if one was sent there. The beacons are visible at all stations even when both or all platforms are 12 car.
I expect this is a failsafe feature, the 450s, 444s and 458s must presumably be running around with ASDO switched on by default even on routes where it is not needed (such as Portsmouth to Southampton). A few months ago during engineering work trains were single line running from Netley to my local station at Swanwick, and the lack of ASDO beacons at platform entry in the wrong direction was detected by the 450s in operation, and at each station a fault message was played...