I'm planning an update soon that'll change the submission form to something more unique for hardware which should help clarify things. Actually I'm going to get working on this today because it's been an issue for some time. Hardware will have name, release date, bar code, part number, description, box text and the images. I'll update this later when it's in place.
As for peripherals, there was a previous discussion where we decided on using Accessories. The category is there and ready to use. I'll be grouping this together with the Hardware on the browse page once I push that update out.