The other problem that we have to think of is the uninstalling of the screensaver. Just using the User folder makes it more difficult to remove all the files that is created by MA3. Like I said, this will require a deeper study of the situation.
There is also the habit of Windows changing the rules for each new version. That is another headache to think about.
Agree with "deeper study", and agree with "changing rules". But Windows rules are
usually upward-compatible if they are followed. For instance: Microsoft has
always said that you shouldn't put user-stuff in \Program Files\. But when Vista started enforcing that, lots of programs broke.
I do not agree that "Just using the User folder makes it more difficult to remove all the files that is created by MA3". It is extremely unwise for an uninstaller to touch files that are in the User folder (generalization, but applicable in most cases).
Consider a common situation: Somebody has problems with an application, contacts support (or a friend). Support says "Probably something is corrupted. Uninstall and reinstall".
Result: all users lose all personal settings.
There is a reason that almost NO APPLICATIONS will uninstall things that are in "user space".
So, it's not MORE difficult to uninstall, if you use the User folders. You just do what "everybody else" does, and ignore anything that is in User folders. That makes it EASIER.
