SINTRA, Portugal (Reuters) - Mario Draghi is seeing out the final weeks of his tenure in charge of the European Central Bank, but his overt hint of more stimulus to come could mean his influence is felt on ECB policy long after he has left the bank's Frankfurt home.Draghi leaves office at the end of October but a fresh round of stimulus in whatever form would set the direction of travel for much of the next year, thus making it difficult for a new ECB president to chart a new course even if they..