Method of Salaah

Sitting and performing Salaah in a coal mine

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)?

Masnoon qiraat in witr

Q:

1. My question is what surahs are the best to be read in witr? (I am referring to a Hanafi Madhad) Which or what surah is the best to recite in the first rakah, second rakah and in the last rakah.

2. Also is it permissible to perform one rakah witr after praying isha? And also is it permissible to perform 1 rakah witr in the dawn?

Mistake in Attahiyyaat and Durood-e-Ebrahim

Q:

1. If one happens to omits portion of Durood Ibraaheem due to one forgetting it or making a mistake, is the Salaah valid?

2. If one happens to recite Tashahud and one repeats the portion( Ash Hadu...) where the index finger should be raised, perhaps due to getting stuck, should one raised the finger twice?

3. If yes, and it was not raised twice, is the Salaah valid?

4. Whilst in Salaah, during Durood Ibraaheem, one adds the words "Sayyidina" before the words and Names Muhammed (Sallallahu Alaihi Wassallam) and Ibraaheem (Alayhis Salaam), is the Salaah valid?