I wouldn't allow a horse to say one day,'I don't feel like turning left' and just say 'oh WELL THEN, we won't turn left, perish the thought you should turn left when you simply don't feel like it'. The LAST thing I would do is just not turn left.
But the way we work the horses not wanting to turn in one direction, it's just not something that much happens. Say I was out hacking around the property, though, and say the horse refused to turn and go across the field away from the barn, or didn't want to go left because there was a stump there it was spooking at.
He'd be turning left real nice before I went on to do something else. BUT...if it looked like it was a losing battle, say, I spent quite a bit of time trying to get past that stump, and he was rearing, throwing himself down on the ground, and I was losing the battle, I would say, 'look, wc, it ain't happnin' today, give it up'. I would blame myself, though, that perhaps I wasn't being firm enough or was trying to go at the problem the wrong way. Maybe using too much rein, or not enough leg, or maybe there is a hole in my basic training where when I use my leg, the horse just isn't reacting enough. Most people, when they have a problem, they go to their rein too much, and in our kind of riding we're always told 'solve your problem on the forward', which means get the horse moving or as the old saying goes, 'forward and out of trouble' (use your leg, if there is no reaction use the whip, get the horse moving forward and most problems are fixable).
You see the basic difference there? We just train the horse differently than western. Where in western the solution is often to stop or turn, in our type of riding, the solution is most always, to use the leg, get the horse moving and that will be the basis of the solution.
Or let's say that I didn't ride for a few days, and my horse was acting up largely just because he was too fresh and I hadn't been working him. My horse is very fit and usually on a five day program. I have to ride him five days a week or he is so fit he is going to be VERY fresh. He's going to pull, buck, take off - in other words, act like a very fit horse. I WANT him that fit. I worked my tail off for four years to get him that fit. He can canter and trot for 45 minutes without breaking a sweat. And I have to deal with him differently because he IS so fit. Well, I would just say that is my fault, and now I am paying for my mistake. I would not take that out on the horse.
But in the way we ride, to me, not wanting to stand still when the horse is restless and hasn't been ridden in a while, is different. For me, if he don't want to halt and stand still, I'm like, 'well of course not. You're about as fit as a race horse and I didn't work you yesterday, my bad, let's have a nice forward canter'.
See? It's just such a different type of riding. The horses are worked very differently - the expectations are different. I expect my horse to stand still long enough for me to get on and settle my reins, and that's about it. I won't even work on halts til he's had a chance to blow out the cobwebs a bit. He comes out of the barn very, very fresh and even ONE day off I have a pretty hard horse to ride - so we don't DO days off. If we have to, if I get sick, say, I make sure I get him moving right away rather than start out working on halts. I'll do that AFTER he's had a chance to blow out a bit of that silliness.
I think though, you may be able to borrow something from it, which is, on a day when the horse can barely stand still, take him for a good gallop, get the sillies out of him, THEN work on the halts. It's not like you give up on halting, it's just that you set up things so that you are going to be successful.
I think of it the same way as Pat describes - instead of fighting with him, just let him move out, let him get the silliness out THEN do the halts.