Method of Salaah

Q: One person who has ta'lluq with the salafees told me that making dua with jamaat after salaah is not established. Therefore we shouldn't make it in group. Rather each one should make his dua separately.

Q: If we are short in time when praying salat, instead of reading the whole "Allahumma salli `ala muhammadin wa.." in Durood, can we suffice with just "Salla allahu alayhi wa sallam", will the sunna be fulfilled by this? Also, is it ok to just mention the Prophet as a pronoun or should he be mentioned by name i.e. "Salla allahu ala Muhammedin wa sallam"?

Q: I would like to know, is it necessary to do sajda-e-sahw if we pray "Subhanarabiyal azim "only once in ruku instead of three times, also if we mistakenly pray "subhanarabiyalala" only once instead of three times in sajda?

Q: I would like to know while reading namaaz, can you have a cd playing in the background (recitation of Surah Yaseen). Because we have learnt that when reading saalah you have to give you full concentration.

Q: I want to know about the saying of ameen in low tone according to Imam abu hanifa as it is contrary to the practice of the Sahaba. Please elaborate. I also know that ameen is a dua and according to quran dua should be said in a low tone but why should we do it when no Sahabi has done it?

Q: In a four rakaat sunnah ghayr muakkad salaah or a four rakaat nafila prayed with one taslim, if one reads in the first tashahhud after the durood ibrahimiyyah a masnoon dua does this entail sajdah sahw? Or is this permissible?

Q: If one has to recite only one Ayah in a rakat of a Salah how long it should be?

Q: In the second rakaat of Witr, one reads Sura Naas.  What Sura should or can then be recited in the third rakaat?

Q: After the fardh salaah, I know according to the hanafi madhab the tasbih-e-fatimi, ayatul kursi etc should be read only after the sunnah-e-muakkida. However, if I end up forgetting or getting distracted after sunnats and find it easier and can be more punctual in recitation after the fardh immediately, and then after that read sunnats, is this permissible?

Q: I have a question with regards to method of performing salaah. If one is performing salaah, whether alone or in jamaah, should the person recite his tasbeehat in a manner that the next person can audibly hear what he is reading or should the brother read it softly so that the next brother cannot hear what the brother is reading.