In a large bowl, whisk together the oil, honey, vinegar, salt, and red pepper flakes. Add the squash and toss until well coated. Arrange squash on a single layer, on a greased or parchment lined baking sheet. Bake at 475°F for 10 minutes, or until tender. Place under the broiler for a few minutes to give it a golden color (also helps to sweeten it up as well).
Let the fresh sage soak in a bit of oil for a few minutes, this will prevent it from burning while in the oven, as well as give it nice crispy texture.
Prepare pizza dough as directed and place on a greased (add some cornmeal if desired for a crunchy crust) pizza stone or baking sheet. Pre-cook dough if recipe/package calls for it.
Arrange squash pieces over dough, add sage, cheese, and sausage. Bake about 12 minutes or until crust is golden and cheese is hot.
While pizza is cooking, make the glaze. In a small sauce pan, add vinegar and bring to a boil. Turn heat down a bit and continue on a low boil until vinegar is reduced and thick.
Once pizza is done, remove from oven and drizzle with glaze and sprinkle with parsley and a bit more red pepper flakes if desired.
Notes
Instead of drizzling the glaze over top of the cooked pizza, you can always use it on the bottom as the 'pizza sauce' instead.