Method of Salaah

Q: Is it permissible for a muqtadi to offer dua after jumma namaaz instead of the Imam? Please advise.

Q: When I am Salah in the first sitting, I cannot point my big toe forward sometimes as it cramps up so I have to move forward and just sit with my toes on the floor. Sometimes I do it just before it happens even though it has not cramped up I do it in preparation for it. Will this be regarded as too much movement and invalidate my Salaah? I sort get half up and then readjust my toe and sit down.

Q: My question is that I've heard that it can be wrong to say assalamu 'alaika ayyuhan Nabiyuu because the prophet sallallahu alaihi wassalam has passed away and instead we should say al-salaam 'ala al-nabi as said by Ibn Masood in Sahih bukhari. Now, majority scholars say that we should not change tashahud after the death of prophet sallallahu alaihi wassalam but my question is Ibn Masood knows better than all of the current scholars because he was a sahaba so shouldn't we follow him because he knows better the prophet sallallahu alahi wassalam?

Another issue I have is that I came across a hadith where prophet sallallahu alaihi wassalam said that no supplication is accepted unless we send peace and blessings on him. I don't remember the source of this hadith so maybe you know. So can u tell me if it mandatory to send blessings on the prophet sallallahu alaihi wassalam every time we make dua and if we forget, that dua will be incomplete?

Q: How can I stop stray thoughts from coming into my mind while performing salaah? What is the best way to concentrate in salaah?

Q: Tell me things in order to make myself become alright in prayers.

Q: I was reacting tashahud in the first sitting or last sitting (can't remember) of 4 rakat isha salah. I did not pronounce the small "kaaf" when I was reading "wa Rahmatullahi was barakatu" the kaaf of barakatu. So I went back to "wa Rahmatullahi" the recited from there till the end. Is my salah valid?

Q: Is it permissible to make dua in Sujood during the salaah? Also, does this dua have to be in Arabic or can it be in any language? I have heard that if dua is made in any other language other than Arabic in sujood during the salaah, then the Salaah is not valid. Is this correct?

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: After a sajdah Ayat in salaah, does one recite Bismillah before continuing with the qiraat?

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.