Various Masaail on Qadha Salaah

Q: A person has excessive (many years) of Qadhaa Salaah. Due to weakness, would it be correct for a person to substitute the Sunnah Muakkadah
before/after each Salaah with Qadhaa Salaah? For example, at the time of Fajr, instead of performing two Rak'aats of Sunnah Muakkadah, a person makes intention and performs two Rak'aat of Fajr Qadhaa. Or at the time of Zuhr, instead of performing four Rak'aat of Sunnah Muakkadah, a person performs four Rak'aat of Zuhr Qadhaa. Would this be correct?

Q: Is qaza namaz acceptable if the prayer was skipped on purpose due to laziness?

Q: If one comes out of a coma, will he have to make qadha for those salaah that he missed while he was in a coma?

Q:

1. Is Azaan Sunnat Muakkada for Qadha Salaats?
2. If one leaves the Azaan constantly for Qadha Salawaat, will he be sinful?

Q: Please could you explain the method of performing qadhaa salaah missed from the time of puberty, as well as clarify the following:

1. Besides sunrise, zawaal and sunset, are there any times during which one cannot perform qadhaa salaah?
2. Should qadhaa be performed before or after adhaa salaah?
3. Is there a limit to the number of qadhaa salaah that can be performed at a time?
4. Does qadhaa have to be performed in the sequence it was missed? If I have missed a salaah today, do I make up that salaah first, or do I continue making up my previous missed salaah?
5. Any other information that you think will assist me in this regard?

Q: If a person has qadha salaahs, can he leave out the Sunnat-e-Muaqqadah and read the qadha salaahs?

Q: Is Qadha-e-Umri a fardh namaz or nafil?

Q: I have a lot qadha salaahs to make up. I am performing as many as possible after each five Salaahs. I perform qadha salaah instead of sunnat ghair muakkadah and nafils. I would like to know, is it ok to miss out performing sunnat muakkada as well so I can complete all my qadhas quicker by being able to pray more?

Q: If one has missed Fajr due oversleep, and one is going to make it up after sunrise or before praying Dhuhr, should he make the recitation loudly or silently if one is praying alone? And what if one performs it together with other people? Or with someone who wants to join him as a nafila for him?

Q: Does one need to make up for those salaah which one missed out for many ‎years due to religiousness? Because a suit and tie Aalim had inform me that one just need to make a ‎sincere repentance because Allaah Almighty is most merciful, most kind and most forgiving. Please ‎answer with proofs from Qur’aan, Hadith and narratives of the pious predecessor.