I don't see how one can decide in advance that he's always going to knee -- or always going to do anything in particular. Every encounter will be different, and you'll have to decide then and there what you should do. Kneeling cuts down your mobility and might therefore be a bad idea in some situations.
You should be able to go to kneeling and shoot. You should be able to squat and shoot. You should be able to go prone and shoot. You should be able to stand with one foot higher than another and shoot. In fact, it's a good idea to be able to shoot with reasonable accuracy standing still, moving forward or backward or from all manner of unusual postures. That doesn't mean that you should decide ahead of time to always use any one, or all, every time.
You should be able to go to kneeling and shoot. You should be able to squat and shoot. You should be able to go prone and shoot. You should be able to stand with one foot higher than another and shoot. In fact, it's a good idea to be able to shoot with reasonable accuracy standing still, moving forward or backward or from all manner of unusual postures. That doesn't mean that you should decide ahead of time to always use any one, or all, every time.
