Salaah

Hanafi Imaam reciting an Aayat of Sajdah according to Imaam Shafi'ee

Q: If a hanafi Imaam recites an Aayat of sajdah (that is according to Imam shaafi'ee Rahimahullah and not according to Imam Abu Hanifah Rahimahullah e.g: The Aayat of sajdah that appears at the end of the 17th juz) in salaah, and he is followed by muqtadis of the different mazhaahib, then what should he do in this situation. If he doesn't make sajdah will their salaah be valid? Is there a solution to this?

Saahib-e-tarteeb

Q: Someone missed Dhuhr for a valid reason, then without forgetting he did knowingly not make it up but prayed, Asr, Magrib, Isha+Witr, then next days Fajr, Dhuhr, Asr then Maghrib time entered, then he made his missed Dhuhr up. In this situation all the prayers he has prayed (before making the missed Dhuhr up) are they valid? Also what if he prayed Asr, Maghrib then Isha time entered then he prayed the missed Dhuhr. In this situation are Asr and Maghrib valid?

Attending only Fajr and Esha in the Musjid due to living far away

Q: I live 10 minutes from a mosque and because of this distance I spend almost 2 hours every day walking to and from the mosque to the five daily prayers.  I am I student and need as much time as possible for my studies. Would it be permissable for me, in order to save time, to attend only Fajr and Isha in the mosque (because of the big virtue of praying these prayers in the mosque) and pray the rest of the prayers alone at home?

Qadha Salaah after Asr

Q: With the Mercy of Allah, I have recently starting reading all my qadhaa salaah that i have missed since i became baaligh, this being a few years of salaah. I am able to read my fajr qadhaa before leaving for work, then my zohr qadhaa after performing zohr salaah, magribh qadhaa after magribh and esha after esha salaah. I have not been able to fit in my asr salaah as I am aware that one cannot perform any salaah afer asr. However, I have been advised, that if i am performing my qadhaa salaah then i can perform it after asr. Is this correct or permissable?