Nikaah & Marriage Issues

Giving the value of mahr faatimi when paying the mahr

Q: I got married approximately 9 years ago. At the time my wife and her father wanted Mehr e faatimi as mehr. However I could not afford the mehr e faatimi at that time. They then agreed to a lesser amount but I told them that insha allah one day when I am able to then I will give her the full mehr e faatimi amount. This was just verbally said and was not written down. 

Alhamdullilah I am now in a position where I can give her the full mehr e faatimi amount. I would like to know if I should give her the mehr e faatimi amount at that time (9 years ago) which was approximately R 12 500.00 or should I give her the mehr e faatimi amount of current value which is approximately R28 000.00?

Delaying in performing the nikaah

Q: I am currently studying, but my future wife's father is sick. Some people suggested that I get married first and then continue studying. At least the father will see his daughter getting married. 

What I am confused about is, isn't it cruel if I haven't provided for her financially or spiritually? 

I think it will be difficult to finish college while working.

Wife making dua that her husband divorces his second wife

Q: If one's husband has made nikaah without telling her and she found out about 3 months later. Her husband did not consummate the marriage and after consulting with his seniors, he regrets what he had done. However he is afraid to divorce the second wife due to backlash. The first wife wants to make dua that he leaves his second wife since he hasn't caused her to to become pregnant which will further complicate things. 

My question is, is one allowed to make a dua as such... "Oh my beloved Allah you create a good excuse for my husband to leave his second nikaah with aafiyah and you make it such that she finds a better spouse for her thereafter". 

Will this kind of dua be allowed?