Permissible and Impermissible actions in Ihraam

Q: Is it permissible to scent the ihraam towel before entering into the state of ihraam?

Q: My hair is very thin, especially my beard hair. If I make wudhu and do khilaal, then sometimes, few hairs fall off. 

I'm planning to do umrah inshallah. My question is that if I am in the state of ihraam and hair falls off accidentally while making wudhu etc., not on purpose, then will there be damm or anything necessary?

Q: Can one perform Umrah with one of those umbrellas that has an elasticated band and you can wear it on your head leaving your hands free... especially when the temperature exceeds 30+ degrees?

Q: If a person is in Hajj with his ihraam on and his friend back in South Africa phones him requesting to borrow his hunting rifle to hunt with, will it be permissible for him to lend the rifle to his friend?

Q: If a person forgets to remove his underwear after making intention for Ihraam, what should he do?

Q: While performing umrah, can ladies wear contact lenses? 

Q: As the Kabah Shareef has a scent/itr, is it permissible to touch the Kabah Shareef or Hajr-e-Aswad while in ihraam?

Q: In the days of hajj days, 8, 9, 10 Zul Hijjah, if there is impurity/najasat (urine drops and semen) on the ihraam but the body is clean with valid wudhu, and later while performing tawaf e ziyarat there is impurity/najasat (urine drops and semen) on the clothes, but the body is clean with valid wudhu, will the hajj be valid or not?

Q: I am 55 years old and I have a disability on my left leg due to which I have great difficulty in walking even a few steps. Now I use a leg brace due to which I can walk even 1 km. However, I have to wear a trouser first so that the brace does not damage my skin. What should I do in ihraam?

Q: When performing tawaaf in the state of ihraam, is it permissible to wear socks?