If you feel the behavior shield is of minimal usefulness, then uninstall it. But I would say that you are wrong, you only need to look at the expert settings to see why it is monitoring the windows update activity.
In the Main settings, one of the three options, Monitor the system for unauthorised modifications. Each windows update item will be changing many system settings, properties (namely registry and files) and this is no doubt the one that is going to be working overtime.
With the behavior shield on Auto (default option) you are probably less likely to get many pop-ups, however when it is set to Ask, be prepared to get lots of questions on if something should be allowed or not. personally I have that option unchecked as I have WinPatrol Plus installed to monitor such system changes.
The recent .net framework updates are even more intrusive as .net gets into a lot of applications, because of the applications that I have on XP that require .NET I actually had 3 .net updates, 2.x, 3.0 and 4.0.
So there are other choices than completely removing/disabling it, your system your choice.