I've adapted the script to and added the "Control Service" commands grouped in the "first time/maintaince region" as was done in Peter's script. Tried a test run and it removes the services on uninstall and adds them on install. That about covers my scenario

I did forget all about "Setup Commands Preceding Apply Uninstall", so I read up on it again. I didn't find a direct link between "Control Service" and that particular topic.
Must I assume that "Control Service" is one of the elusive "New Windows Installer Commands"? Or did I overlook something?
It might be handy to have to complete list of "New Windows Installers commands" instead of a "reference to some commands".
You could consider this as improvement for the help.
Anyway, thanks again. I'll be on my merry way
