Don't you 'shoo' things with gesture too? As in "Shoo! Shoo! go away!" to animals or a child hovering too near the cake tin. At the same time you flap about with your arms too! So you could shoo someone along to anywhere I think- certainly over the finish line of a race. Shoe-in sounds too much like Cinderella.

I'd prefer a congenial lawyer to a congenital liar any day, though the possibility exists that they could be one and the same.