We used to add small amounts of breadcrumbs (unseasoned) or instant potato flakes to our sausage mixes before stuffing into casings- it helps retard water loss. But as someone above pointed out, the secret to juicy sausage is to go heavy on the pork fat.
make basil butter
This is a good way to give a nice basil flavor to things.
Basil-Horseradish butter
Just blend together basil, butter, horseradish, salt and a little lemon zest & juice. Roll into cylinders, freeze. Really good on salmon. HTH