Method of Salaah

Q: In order to create more space in the Musjid for Musallees on the occasion of Jumuah, we ask all the Musallees to move forward one step. The problem is that those Musallees in the first saff who are in line with the Mimbar, when they step forward, they have insufficient space for sajdah and thus make make sajdah on the step of the mimbar.

1.Is the Salaah of these Musallees valid?

2.If the Salaah is valid, is it Makrooh for them to make Sajdah in this manner?

3.In these circumstances, is it permissible to leave a gap in the first saff in line with the mimbar?

Q: I heard that that the hands should be placed on the chest during salah because there are sahih hadith on this. And also, the hadith of placing hands below the navel is weak. Is this true? I've been told it doesn't matter much where the hands are placed as long as the prayers are offered, but I still would like to know the correct way.

Q: Can we make dua during our salah? Is it not allowed to supplicate our dua in sujood (sujood not in between Salaah)?

Q: Is ayatul kursi supposed to be recited after the fard rakats or the whole salaah?

Q: When praying, I usually go through it fast and I don't feel a connection with anything. What can I do to feel connected to Salaah. I don't know. Please help to make me connected to Salaah.

Q: Will my Salaah be valid if I omit the dua and end with durood-e-ebrahim?

Q: What should the Imam recite in the thrid rakaat of Maghrib salaah?

Q: My question is what do we recite behind the Imam in the third rakaat of Maghrib and third and fourth rakaat of esha and dhur and asr. 

Q: I recently led the jamaat for zuhr salaah and for some reason I have doubts and cannot recall if I read the same surah in the 1st and 2nd rakaat (after surah faatiha). I don't know the two gentleman that read behind me. What should I do to rectify this? What if I cannot find them?

Q: I work on a coal mine, where the roof is not high enough to allow one to stand up straight. We work morning shift for a week and night shift the next week. Dhuhr is delayed until returning to surface when working morning shift, however salaah is performed underground when working afternoon shift. As one is required to stand upright, is it required to a) sit and pray (and then repeat the parayer when on surface) or b) stand and pray (even though one stands slightly crouched)?