[The following is an abridged response. Please see URL for original question and answer.]
Men are the imam for men or both genders. Women should be an imam for woman only.
It is God who rules and Muslims in general regardless of gender are to interpret, explain and execute those rules, no difference between man and woman. There were some occasions in which the Prophet Mohammad (PBUH) referred to Aaishah his wife as to learn half of your religion from her, and also he said: "Seeking knowledge is a must on every Muslim male or female".