Regarding my Question 3 and Q. 4 :
I found a noteworthy thing in the book of Quranic Laws (Qurani Qawaneen) of late Allamah Parwez .
I think this can answer those questions .
Chapter 3 : Justice > Page 47
“ As far as the question of two women in lieu of a man is concerned, the Quran itself has explained the reason; i.e., if one woman forgets or is confused, the other shall remind her. This clarifies two points:
i) Firstly that in that period the women were such (due to illiteracy) that they were not able to describe their own case properly (43:18) and that it was seldom that a chance arose for them to take part in the collective affairs; it was not unexpected of them to get confused before a court of law.
ii) Secondly the need for a second woman arose only when the first one got confused and forgot. If the first woman remained free of confusion and forgetfulness, the second woman could neither interfere nor her testimony was needed.
This fully explains that, in fact, two women are not appearing as separate witnesses; one would suffice provided she does not suffer confusion in the court.
It makes clear that women are not considered unreliable as against men on the basis of being women. It is only the special conditions that are kept in view. When such conditions remain no more, the testimony of one man and one woman shall be considered equally trustworthy. “
“..It is only the special conditions that are kept in view. When such conditions remain no more, the testimony of one man and one woman shall be considered equally trustworthy.”
*Can we conclude this instruction is an optional and conditional law that the state can even change/suspend/ignore it depending of circumstances of the time and society (i.e. it is not mandatory) as well as two capable women alone can be taken as witnesses (i.e. there is necessarily no need for a man when there are expert women) ?