I've never heard of the factory extending a warranty because the "item" was simply not being used (or in your case, sitting in a repair shop waiting to be fixed either).
If you need the extended warranty, you'll probably have to pay for it, get one of those extended plans. Sorry for your delays. FYI, Keystone IS having problems delivering. I'm waiting on a part (through my dealer) for my Outback. My dealer (repair shop) told me when I brought it in, it might be a while, as Keystone's deliveries have really slowed down due to the weather in Northern Indiana. I'm expecting a 3 week wait. One week has already passed. It's not the dealer's fault if the parts don't come in.
Also, they are probably waiting till all the parts come in and then fix everything at once. Otherwise, they're constantly moving RV's in and out of their shops. Every time they move one, there's a risk (on their part) something could get damaged. Although they are professionals, they still use caution and don't move them around any more than they have to.