Right now, no, the cards cannot have more than one category. We'll see what we can do in the future about that.
And yes, a message with the general guidelines is *exactly* what we'd like to see pop up when you click to upload photos to your gallery. It's on "The List".
And Beate . . . if you're baking, I will so brave the rushing floodwaters to go visit later! BTW, when does your mom's baking come? Make sure that she knows which ones I love