My wipers leave a 1" long section of water/snow right in my line of site. Its not that they are missing, but a matter of not covering the whole area. Is it possible to fit something longer that wont disrupt their movements?

Try using Rain-X. Since it reduces the viscosity of the water on your windshield, the wiper removes water more easily, and the streak is gone. I think that's what you're saying, right? Streak in the middle of the blade's path?
If not, I got nothing for ya... ;-)

for when your head is sticking out the sunroof.

Kidding.