Yes... and I definitely think it should be bantam rooster to standard hen. My silkie roo has successfully covered a standard EE without any problems and just the thought of my FBCM roo over a bantam hen makes me shudder... he would crush her!
Oh, you betcha! I have quite a few little sports from my Silver Sebright and bantam Cochin roos running around my yard, with Blue Orp and Wyandotte moms.