Hair and Nails

Q: Can women keep their hair 2 lengths? They call it layering. According to what I heard from one Aalim is that Nabi (s.a.w) prohibited from qaz (shaving the sides and keeping the hair big on the top), but to have a small difference is ok. For example to cut 4 on the top and 3 at the bottom. So my 2nd question is that is the fatwa that we generally learn from our ulema regarding males is on a precautionary/taqwa basis?

Q: I would like to know the shar'iee hukm of applying color on hair for both men and women? Could you please explain that in detail specifying the correct use of color?

Q: If it is Sunnah to put mendhi or dye the hair and beard, then how can they be reward and it be good to have white hairs, as the more white hairs the more the merits?  And if it is Sunnah to dye the hair, didnt Nabi (s.a.w) have white hairs when he passed away?

Q: Is it permissible for a male to plait or braid long (Zulfa) hair? If a male has long (Zulfa) hair and he occasionally plaits them with the intention of sunnah will he be rewarded?

Q: Is it permissible for women to fasten the hair in such a manner that it forms a hump/bun?

Q:

1. Did Nabi (Sallahu Alaihi Wasallam) ever trim His Blessed beard?
2. If not, how is a fist lenght beard an emphasized Sunnah?
3. Which is more rewarding; a trimmed fistful beard or a completely untrimmed natural beard?
4. On what basis is it sinful to trim (not shave) the beard less than a fist length (and not resembling the non-believers)?
5. Is there any Narration that directly prohibits trimming (not shaving) the beard less than a fist length?
6. Is Miswaak, wearing a turban on the same level as Sunnah, higher or lower, in comparison to having a fist length beard?
7. Is a person sinful if he does not use a Miswaak or wear a turban?

Q: 

1. Is there any Quranic Verse or Narration that directly prohibits women from cutting their hair in a manner which does not resemble the non-believers or men? 
2. On what basis are women prohibited from cutting their hair in a manner that does not resemble the non-believers or men?

Q: Is it allowed in Islam for a male to neaten the beard (NOT CUT) while it is still growing to a fist length (Not yet a fist length) as I am still in my teens and my beard has become extremely wild which is not exactly 'in my opinion' what Islam teaches. To me Islam teaches dignity in portraying ourselves to promote Islam rather than be seen as primitive and uncouth. 

Q: Can men remove their hair (chest, stomach) if your answer is no then please provide how much area we can remove?

Q: Is hair dye permissible for some one who's age is 38 and his wife asks him to dye his hair?