While I realize taste is entirely a personal preference, unless you are smoking poor quality I see no reason to try to add any flavor to your stash. The flavor should be able to stand alone. I see no reason to flavor your stash unless you have something to hide (like the taste).

As for freezing weed it is easily done. I will put it in a little bit green, and the dry cold air will finish it for me. Whan brought out it will get dry, fast, so I try not to open it, or remove it from the cold. If left unoppened it can last a year in the freezer and come out perfect.