I just thought of a benefit of creatine while dieting. Actually, several. First off, because of the water retention, you will keep fuller muscles than you would otherwise. Secondly, from what I understand, creatine helps you keep energy/explosiveness during exetended periods of exercise. I don't know what kind of training you are doing, but, when I diet, I increase my volume and the duration of my workouts. If you are doing this, then creatine may help you keep optimum energy and intensity levels during your diet.
Edit: I just re-read your original post. Personally, when I diet, instead of try just to maintain, I try to gain strength and, potentially, muscle mass. I don't know if it's just because my body gets used to higher reps and develops a better endurance, but I get stronger every time I diet. Not that I could ever beat my PR's, but say I do DB presses with 80's for 6 reps to begin with. By the end, or at least the middle, of my diet I can do 90's for 10-12. I don't know if that's a strength gain or an endurance gain, but I would advise you to try and get stronger or bigger or anything besides just maintaining.