Martin, from what I understand they can be trained to recognize their name. However, I'm a firm believer that if you spend enough time with most animals, they can do a lot more than what is considered the norm. At my workplace, I've seen them learn to open basic locks on the cages. I'm not sure if they can be litter trained, but I know that in nature, the prairie dog colonies designate a certain area for a "toilet" so that they don't contaminate their food source with their own waste.
Zoe, you are correct, I forgot that there is indeed a different design for the pull-out pan feature. I'm not sure if we carry the same style in a smaller size then, but I would check out the store's website. It lists most commonly available cages. I hope this helps some.