Is this a real problem that happens in reality right now? I regularly hear of entitled home owners putting up cones or other stuff to block street parking in front of their house. In fact this has become a popular meme on r/portland. I've never heard of someone parking in someone else's driveway (maybe blocking it, but parking enforcement seems to be a popular revenue stream) or front yard.
Also, if police cannot even be motivated to get cars off other people's property, that seems like a big problem that we should address, rather than restricting what we are allowed to build to work around the police not doing their job.
Isn't it already illegal to park on other people's property without permission?