Your colt is a very nice looking guy, but why would you breed him KNOWING he actually has the gene that causes Lethal White? Even a mare that has no color, can pass on Lethal White to her foal, because unless tested, there's no way of knowing she's a carrier.
If he has the lethal white I would probably let people know they should have their mare tested before breeding. It would be sad to think you were going to have a gorgeous, healthy foal only to loose a baby very shortly after/during birth. Good luck with him. He is a pretty boy.
Everyone knows he has the lethal white gene. I neck rein him from the ground, but I've ridden him bareback for 20 minutes a week. My vet said it was alright. You have your opinions, and I have mine. You don't even know the horse so you can't even say whether he's stud material or not. I did put my wants before him. So you have no right even saying that. These people came to me wanting to breed. A lethal white foal has a good chance of living and being perfectly healthy too.
However, I gotta say, I think you're making a pretty darn irresponsible decision by keeping him a stallion. Really.
Colour and bloodlines are absolutely useless if all you're doing with the foals is throwing them outback.
You do NOT get a healthy lethal white foal. They DIE. That's it.
That's hardly fair to the foal, or the mare who's got to bear that pregnancy and deal with emotional stress after.
As for riding a 1 1/2 year old, I won't go there. But if your vet said it's okay, get a new one.
I understand he's your horse, and it's your choice, but in my opinon, in regards to riding and keeping him a stallion, it's a poorly educated, very selfish decision, and I seriously think you should reconsider.