Salaah

When should the tasmee and tahmeed be recited?

Q: 

1. I am a student of deen. I wish to know whether the imaam and muqtadee should recite tahmeed in salaah? If they should recite it, then when should they recite it? Should they recite it while rising from ruku or while standing in qaumah? I have heard that there is a difference of opinion in the Hanafi Mazhab in regard to this mas’alah.

2. Should the munfarid recite tasmee and tahmeed or only tahmeed?

When should the tasmee and tahmeed be recited?

Q: I was always of the impression that the muqtadee should recite tahmeed in qaumah after the imaam completes reciting tasmee. However, I was lately informed by certain Ulama that the muqtadee should recite tahmeed at the same time that the imaam recites tasmee. I would like to know whether this is correct? I also wish to know whether all my past salaah are valid since I have always been reciting tahmeed in qaumah after the imaam completed reciting tasmee.

Qunoot-e-Naazilah in Fajr Salaah

Q: I follow Hanafi madhab. Since a few days, our Imam is praying dua in fardh of fajr salaah. On the very first occasion he did this dua in the fardh of fajr in the second rakah before going to ruku and from the next day he started doing it after getting up from ruku.

Now with the differnce in these 2 days, is our fardh salaah valid on both occassions? I know about the special prayers to make when in distress if the Islamic world is facing problems but is it allowed in the Hanafi madhab?

Will preventing someone from walking in front of one while performing salaah be considered amal-e-katheer?

Q: It is written in Behishti Gohar that it is allowed to prevent a person from crossing in front of him while he is praying. However, if 'عمل کثیر' happens, then the prayer will become fasid.

What will be considered عمل کثیر ? What should the musalli do to prevent the person from crossing him?