No custom thumbnail option - Help!

It could be that it has not yet been activated for your account. I thought YT was rolling this feature out to everyone.
Hmm weird you have an account in good standing? Otherwise I do not know why you don't have it.
I had an account before and as soon as they released it to everyone it appeared.

It may be because I don't have enough views or videos as I only have 3 videos? Could that possibly be why?