Rukoo and Qaumah

Q: Should an imam read the extra duas in jalsa and qaumah when performing salaah in jamaat? Or are these not to be read while performing jamaat?

Q: Is it acceptable if I recite subhaana rabbial azeem in Ruku and subhaana rabbial a'la in sujud one time only instead of three times in the case when there is limited time available. For example I am performing Sunnah Salaah and Jamat has started or Qadha time is near etc.

Q: My question regards the raising of the hands before and after ruku. I have read that there is not sufficient evidence to prove that Nabi (Sallallahu Alayhi Wasallam) did not perform this action during Salaah. The same applies to the positing of the hands during Qiyaam (on the chest or below the navel). I would be indebted if Mufti could please provide supporting evidence.

Q: Is Raful-yadain a sunnah or a part of an outdated Hadith?

Q: What extra Duas can be made in Jalsa, sujood and qiyaam?

Q: Does reading in salaah "Rabbana lakal hamd" with qalqala at the end break the salaah?

Q: Sometimes in rukoo' I do the thikr and then I straighten myself a bit and hear a crack, so does that mean my back only became straight when it cracked? If so do I do the thikr again? Must the back in sujood rukoo sitting and standing always be straight or at ease straight? Is the neck or head considered in this?

Q: In Ruku are the elbows meant to be tucked in or sticking out?

Q: When having risen from Ruku, does one recite Rabbana Lakal Hamd or Rabbana Walakal Hama (i.e. with the و or without the و)?

Q: Can a person read the following Dua in his Fard Salaah:  حمدا كثيرا طيبا مباركا فيه after reading: ربنا و لك الحمد, in ruku', similarly can he read in jalsah: اللهم اغفرلي و ارحمني و عافني و اجبرني و ارزقني and if he is a muqtadi can he read these two dua's?