The question is not Gods ability to work outside the norm..the question is do isolated events become the pattern for the church .If so we may need to start to send some asses to seminary
You are looking at the story from the perspective of the ass speaking. Have you considered Balaam's disobedience? It would be better to send an ass than disobedient men. Balaam was a man whose mouth said "Yes" to God while his heart said "No".