Falling to his knees on a subway train, a young Brooklyn man allegedly grabbed the feet of scores of female straphangers - kissing and licking them until the women screamed. But last night Joseph Weir, 23, kept his mouth shut and let his lawyer do the talking as he was arraigned in Manhattan Criminal Court last night on charges of unlawful imprisonment and forceable touching. The tall, thin, shy-looking suspect has already confessed to abusing at least 70 female straphangers in the past three years, cops said. The admission came after police busted him Thursday for allegedly violating a woman...