Various masaail of Salaah

Q: In salah, can we repeat the translation of holy quran in the heart for the sake of khushu n khuzu?

Q: I have noticed that in certain Masaajid, where a protruding mic is used as compared to the clip-on mic, the Imam swerves in a crescent like motion as he proceeds from Qiyaam into Ruku. Again, when he returns from ruku, this swerve, clear and deliberate, like a crescent motion , is repeated, again, when he proceeds into Sajda and when eventually returning to Qiyaam, in each and every Rakaat, whenever moving in or out of Qiyaam, this swerve motion is clear and deliberate and apparent. In Some Masaajid, the protruding mic which is positioned lower for the sajda also requires this additional deliberate swerve motion too so this is a new but clear and deliberate 'additional swing motion' to avoid hiting the mic, which has been specifically positioned directly in front of his mouth. Although his chest does not move from the direction of Qiblah at all, this does seem like a new, foreign and additional motion in Salaah. Please comment in general as well as specifically whether this affects the value and or validity of this Jamaat salaah, as it is a 'new norm' of Salaah adopted by the Imam out of necessity, to avoid hitting the mic as he moves from one position of Salaah to another.

Q: What is your opinion on this:

http://homeshopping.pk/products/Digital-Prayer-Mat-in-Pakistan-.html

It shows the rakats prayed on near the place of the sajdah, so the one praying can see the number of rakats he has prayed. But according to hanafi fiqh reading and understanding such as from a piece of paper during salaah is makruh? I heard in a lecture that Aisha radiAllahu anha would switch her ring from finger to finger to keep the rakaats in record. And also the qawl of Ibrahim an Nakhai that there is no harm in doing so. True?

Q: What is meant by not receiving the reward of salaah?

Q: I'd like to know if it's true that it's good to change places when we do salaah, because on the day of judgement, all these places where we did salaah will testify for us? For example, in a same home, I do fajar in the bedroom, zohar in another room and so on? Please enlighten me on this subject.

Q: Please inform me about sajdah-e-shukr. Which mazhabs says it is jaaiz and which says it is not?

Q: I heard that Bibi Khadija the wife of Nabi S.A.W died befor making any Salaah. Was salaah at that time compulsory or not? If yes then when was salaah made waajib?

Q: Can we pray in a room without light where I cannot even see my hand. (This is told by barelvi friend that we cannot offer prayer where we cannot see anything. There should be enough light so that we can see the colour of our prayer rugs.)