I was not prompted to reactivate the product or input my product key after I deleted the folder from the registry. This is really strange, now that it has occurred to me
It's possible it won't always happen, because the QLM licensing has cached your activation in another part of the registry, but it might happen, so not touching the key is safer.
. Also, surely using the ‘add or remove programs’ Windows feature would simply run unins.exe in Addon Manager, making the process identical.
Sure, this IS identical but, that's not what you said you did. You said you edited the registry, which was completely unnecessary.
This means the virtuali folder in Roaming, the Addon Manager folder, and the fsdreamteam folder in the registry would still remain on the computer after uninstalling. Is there any way you could sort it so that when you run uninstall it will remove all these disc and registry folders? Or at least, all the disc folders and the registry file that stores the directory path for Addon Manager.
NONE of these files in %APPDATA% or %PROGRAMDATA% have any effect on the Addon Manager location. The ONE and ONLY setting that controls it, is the "root" key of the fsdreamteam key, nothing else.
As far as I know, you will always have to go into the registry to delete that specific file manually if you want to change the location of the Addon Manager folder.
You don't. As I've said, since the one and only setting that controls the location of the Addon Manager is the "root" key of the fsdreamteam key, and that one IS removed by Uninstalling the FSDT Installer, there's nothing else to do manually other than just running the uninstaller.
And, of course, removing files in %APPDATA%, where all your custom settings are stored, your own custom airport profiles and your custom airplane profiles, would be very wrong, since you wouldn't have any way to restore them unless you made a backup, and not removing these files is standard Uninstaller practice, and if an Uninstaller allows it, it's usually very clearly labeled as a specific option for a "Clean Uninstall", which again was completely useless in your case, if your goal was JUST "move the Addon Manager".