Andy,
I have done it.
I only take the time to make meatballs when I've got an all day sauce brewin. Sometimes when mixing the meatballs, I'll freeze a bunch of them.
If I'm making a "quick sauce" and can't let them cook in it, I'll pan fry or sometimes oven bake them.
I agree that the texture is superior, but the flavor is not nearly as good.
If you had one of my meatballs that was panfried, you'd like them.
If you had one of mine that was cooked in my sauce, you'd kick your momma for showing you the wrong method.
That's all I'm sayin...