Conditions for the validity of Salaah

Q: Is salaat valid if performed with a small tear in one's trouser exposing a little bit of one's thigh? Does salaat performed in this condition have to be repeated?

Q: When reading say maybe 4 sunnats of Zuhr Salaah. Can one make multiple intentions, for example, intention for wudhu salaah as well. Or is multiple intentions only acceptable in nafl salaah? 

Q: I was travelling to Durban and stopped in Harrismith to make Zohr. On my was back I stopped again to make Zohr, and was told after I completed my salah that I was facing the wrong direction. I am not sure if the brother was correct, but do I need to repeat my salaah?

Q: 

1. Is it permissible to shoot paintballs, now that there is evidence to show that the paintballs are made from swine?
Will the masala differ according to how much of pig gelatine is used in the paintball? 

2. Can a person perform salaah if he has these paintball stains on his clothes?

Q: Is it recommended to delay the Fajr prayer and Asr prayer?

Q: Will my salaah be regarded as qadha or adaa if the next salaah time enters while performing the salaah? 

I know the salaah is valid, but I want to know if my salaah will be qadha because of it or it will be regarded as adaa.

Q: If I place a pure prayer mat on an impure carpet and pray on it but while making sujood the edges of my long jilbab touch the carpet, will my salah be valid?

Q: Is it compulsory for a woman to cover her feet during Salaah?

Q: If Maghrib ends at civil twilight end (depending on the place, 30-40 minutes https://www.timeanddate.com/astronomy/usa/chicago ), then why do apps prescribe a completely farther time for Isha?

Q: A person commenced his sunnat of Zuhar. Then he realized that the time of Zuhar is about to end so he changed his intention to fardh. Will this intention be valid?