Witr and Nawaafil

Making niyyat of four rakaats and making salaam after two rakaats

Q: If a person commences performing four rakaats sunnat ghair muakkadah, before Asr or Esha, but due to the jamaat salaah starting, he only performs two rakaats instead of four, then will he need to perform these four rakaats later on after the jamaat? (The reason I am asking is that I have read that once we start salaah, even a nafl salaah, it becomes waajib to complete it.)

Reciting aloud in nafl salaah

Q:

1. Regarding any nafl salaah, I would like to know if it is permissible to read the qiraat aloud, for purposes of dhor?

2. If it is, should one perform the salaah as though leading a jamaat, i.e. say takbeer for postures aloud, etc.

3. Do the same rules above apply for qadha salaah as well?

4. What are the rules for performing nafl salaah in jamaat, e.g. with one's spouse or household?

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?