Yeah, it seems that there hasn't been much work done with the steeds since their release, unfortunately. It would be awesome if they were to polish them a bit more. I love using my war pony around, and use it for both traveling and fighting. I hardly use my regular mounts, since I love the option to customize the war steed. It's a shame that after RoR, war steeds were pretty much left in the dust and some players dislike them. Yeah, they do have their problems, but I do like the way they are animated, and wish there were more choices, as far as customization goes for them, like adding more tack options for them. Where's the simple bridle, saddle, and saddlepad, for when you aren't gearing up to slay monsters or do not quite want to dress like you're prancing in a parade? Another cool option would be to maybe play the instruments while mounted on the steed, or any horse or mount in general. Imagine, if you will, players parading with their steeds, and playing instruments as they walk down the towns and cities, or even across the landscape from town to town.
Another thing they could do (but doubt they will touch the steeds at all) is to fix the strafing a bit, so that the turns are a bit smoother, rather than the horse looking like it's sliding at faster speeds.
"I will not say do not weep, for not all tears are of evil." -Gandalf ROTK
"Love can make a summer fly, or a night seem like a lifetime" -Andrew Lloyd Webber