It is preferred to have a woman imam for women
     'Aishah used to lead the women in salah and stand with    the women in the middle of the first row. Umm Salamah    would also do so. The Prophet sallallahu alehi wasallam    appointed Waraqah to go and make the adhan for her while    he instructed her to lead the women of her household in    the obligatory prayers.
    
A man leading a group of women in prayer
     Abu Ya' la and at-Tabarani, in al-Ausat, record, with a    hasan chain, that Ubayy ibn Ka'b came to the Messenger of    Allah and said: "O Messenger of Allah, I did something    last night." The Prophet asked: "What was that?" He said:    "The women in my house said, 'You recite and we do not    recite so lead us in salah. ' So I prayed eight rak'atand    witr (with them)." The Prophet remained silent, and Ka'b    said: "We took his silence as a sign of his approval."
    
Evildoer or innovator forbidden to lead prayer
     Al-Bukhari records that Ibn 'Umar prayed behind    al-Hajjaj. Muslim records that Abu Sa'id al-Khudri prayed    salatul 'id behind Marwan.
         Ibn Mas'ud once prayed four rak'at of fajr, behind    al-Walid ibn 'Uqbah ibn Abu Ma'it who used to drink wine,    and 'Uthman ibn 'Affan had him flogged. The companions    and their successors prayed behind Ibn 'Ubaid who was    accused of propagating heresies. According to the    scholars, anyone whose prayer is valid on an individual    basis, his imamate is also valid for others. However,    they dislike to pray behind an evildoer or innovator.
         As-Sa'ib ibn Khilad relates that a man was leading the    people in salah and he spat in the direction of the    qiblah. The Messenger of Allah saw this and said: "Do not    let him lead you in salah." After this, the man wanted to    lead the people in salah but they prevented him and told    him what the Prophet had said. The man went to the    Prophet sallallahu alehi wasallam, to ask him about that,    and the Prophet said: "Yes, [it is true] for you have    offended Allah and His Messenger." This is related by Abu    Dawud and Ibn Hibban. Abu Dawud and al-Mundhiri are    silent about it.
    
Permission to leave the congregational prayer
     If the imam makes the salah too long, it is permissible,    under certain circumstances, to leave the salah with the    intention of performing it individually. The following    are examples of when this may be done: becoming ill,    fearing that one's wealth may be lost or destroyed,    missing one's companions or traveling group, being    overcome by sleep, and so on. This is based on the    following hadith related by Jabir: "Mu'adh would pray    'isha with the Prophet sallallahu alehi wasallam, and    then go and lead his people in salah. One night, the    Prophet delayed salatul 'isha and Mu'adh prayed with him    and then went to his people and led them in the night    prayer by reciting alBaqarah. One man left the salah and    prayed by himself. The people said to him: 'O so and so,    you have become a hypocrite.' He said: 'I have not become    a hypocrite but I shall surely go to the Prophet and    inform him of what has happened.' He told the Prophet    what had happened and the Prophet said to Mu'adh: 'You    put people to trials, Mu'adh! You put people to trials,    Mu'adh. Recite such and such surah.'" This is related by    the group.
    
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"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
Prophet Mohammed (PBUH)
"The best of what a man leaves behind are three: a righteous child who supplicates for him, ongoing charity the reward of which reaches him, and knowledge that is acted upon after him."
Sunan Ibn Mājah
"Every day two angels come down from Heaven and one of them says, 'O Allah! Compensate every person who spends in Your Cause,' and the other (angel) says, 'O Allah! Destroy every miser.'"
Sahih Bukhari