Mike - if you specify the fields as NOT NULL, then MySQL will just write the default value you set for that field (0, 1, empty - whatever). I suggest you set NOT NULL anyway - it'll make if a slight bit faster.
John - Not noticably. As long as you don't search through the fields you added, very little should happen. However, the more fields you want to pull, the slower the query will become (especially with BLOBs)
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