Method of Salaah

Q: Is it permissible for the imaam to recite the sunnat duaas of qaumah and jalsah while performing fardh salaah?

Q: When we sit between the two prostations, is it mandatory to say rabbigh firlee or is it just recommened? Kindly tell me the Hanafi view regarding this and if possible please also tell me what the Maaliki, etc. say. I came to know that it is mandatory to say this and salaah is not valid without this.

Q: Let's suppose we are offering zuhr namaz or any other namaz as a muqtadi in the mosque behind the Imaam. In the second rakat when we get up from the first rakat do we have to say the "Tasmia"in the start of second rakat?

Q: I am offering namaz as a muqtadi in the mosque. I want to know that at the start of the prayer when we say "Allah hu Akbar" do we have to say "Sanna" only or do we have to say "Ta'awwuz" and "Tasmia" as well after the "Allah hu Akbar"?

Q: Which two small surahs can be recited for namaaz-e-tauba?

Q: I heard that the Surah recited after Surah Faatihah in the second rakaat should be shorter than the one recited in the first rakaat. What is the Shar'ee ruling regarding this?

Q:

1. Must the surah recited in the second rakaat be shorter than the surah recited in the first rakaat?

2. If so, how is the length of a surah determined?

Q: Is it permissible to make dua in congregation after fardh salaah? Is there any hadith in which it has been called an innovation in Islam? 

Q: I read in tafseer Ibn kathir that Surah Fateha has seven verses in it and there are some Hadith also there in that tafseer from two sahihs that Bismillahir rahman nir Raheem is a first verse of Surah Fateha. There are only seven verses in Surah Fateha. Now, I saw in Sahih Bukhari Narrated From Anas bin Malik (radhiyallahu anhu): Nabi (sallallahu alaihi wasallam), Abu Bakr (radhiyallahu anhu) and 'Umar (radhiyallahu anhu) used to start the prayer with "Alhamdulillahi rabbil aala min" Vol-1,book 12, number 710. ( Sahih Bukhari-- characteristics of prayer). Now, what should we start the prayer with?

Q: Please can you tell me if my salah is valid if I forgot to say takbeer after the first tashahud and did not perform sajdah sahw.