Jamaat Salaah and Imaamat

Q: What is the repercussions of performing Salah alone?

Q: How important or what status (Fardh, Wajib) is Salah with congregation?

Q: Does salah with  women congregation hold the same rewards as with men? or does the obligation of congregation fall?

Q: I went to a musjid late, when asr namaaz was over. However, I noticed a second jamaat taking place in the sehen,so I joined it. I got the last rakaat. So after salaam I completed my 3 rakaats. Now, after a few days, I discovered that the jamaat namaaz which took place was by musaafirs, so they read 2 rakaats, and I completed 3 rakaats, what is the condition of my namaaz? 

Q: It takes our imam a bit long to go into sajdah, standing up from sajdah, etc. So what happens, for example, is that after qaumah, as the Imam goes down into sajdah, he says Allahu Akbar, and we also go into sajdah, but some of us reach sajdah before him. Is his and our salaah valid? Should we request him to rather try and do his postures slightly faster? I think it is because of his weight problem.

Q: In a maghrib salaah, if I join the jamaat in the third rakat, the next two rakats do I have to recite a surah after surah fatiha? Do I have to sit in tashahud in both the remaining rakats? Similarly, how do I do it in isha if I joined in the last rakat?

Q: My house is about one bus stop away from the mosque, which is about 10 mins walk. So, when I'm home, I do the salaah at home and sometimes go to the mosque. Please advise.

Q: I actually belong to India (hanafi) but I've been living in Singapore for the last 4 years because I work here and it is shafii fiqh followed here. So, are my prayers valid behind an Imaam of another mazhab? And there would be a slight variation in the salaah in fajr here to as of what we do back in India.

Q: Is a person's wife being scared i.e when left alone at home, (so scared that if there was some noise on the roof she would duck down on the floor) a valid excuse for the husand not attending jamaat salaah in the musjid eg. fajr salaah?

Q: If there is a resident Imaam of a Masjid, who adheres to the Sunnah outwardly and by Mazhab he is a Hanafi and another Imaam from outside who it seems as though trims his beard is a Shafi/Maaliki. The question is that can the Second Imaam who is not the resident Imaam be allowed to lead the Eid Salaah on the basis that the crowd that attends the Eid Gaah is generally Shafi/Maaliki? If not then will the sin of appointing him to lead the Eid Salaah be on the board members? As the resident Imaam had informed them that the sin will be on their shoulder and not his. Is this statement correct?