Nope, those are not allowed. (Which is kind of too bad, IMO, but dealing with things like foot tackling and sweeping kicks would seriously alter the nature of the game.)
They used to score a "perfect block," but I haven't heard anything about it in years. It's defined as being, basically, a block delivered with full power with an appropriate blosking tool while the defender maintains his balance and causes the attacker to lose his balance. It was worth 1 point and, I think, a good way to keep the defensive nature of martial arts in a sparring event. I doubt it was ever scored much but in a close match it could make a difference.
Master Weiss was an ITF certified referee. Maybe he can offer a bit of insight on that topic.
Pax,
Chris