Flight
It's a bird! It's a plane! It's...a flying mountain dwarf?
I was hoping for the possibility of two things (one of which is somewhat in conjunction with the other). The first hope is slightly off topic. The ability to tame any non-human monster for a pet (perhaps make it a skill and the closer to 100 the skill gets, the more loyal the taming). Aside from fleshing out the game quite a bit, this also brings in the question of flying. Say you tame a white dragon and you want to fly around on it. This saves your character from using energy for walking (which increases duration between when you have to eat) and also means you could avoid ground confrontation with monsters (but incur the possibility of having to battle monsters in the air (like hawks, other dragons, etc). Flying would be faster than walking (clearly) but the more you fly, the more tired (and weaker) your pet gets. So there's a balanced trade off. Also, flying allows you to move over mountains (so instead of getting a climbing pack and raising your skill in climbing, you could train your tame skill and tame a flying monster). I know this is a bit of a long way off, but I felt at least documenting it for later consideration would be good =P.