Actually if they were going to do this they should have all speeders freeze up on Hoth and Ilum after a while. The only working one would be the Tauntaun and possibly a new "Special Cold Weather speeder". It doesn't have to be that annoying you could just get thrown from your speeder after five minutes and then be able to get right back on. It would add to the cold weather feel of the planet ,which at the moment, basically amounts to your companions complaining about it.