Taking a hundred oaths

Q: I have a question about oath in the name of Allah, if a person writes in a word file about some forbidden acts, (specifically online pornography, going to specific chatrooms etc) not to be done and includes some exceptions to the rules including an exception that states: All other points and events that I may not be able to mention at the moment or may appear to be challenge later on in time may be added any where in this file if needed. finally if person say 100 Oaths of Allah Applies to this document and valid upto for example 31 march 2015. If intentionally this person breaks any or all rules mentioned in the document lets say in November 2014, what will be the kafara for the Oaths, will it be for 1 Oath or 100 Oaths. Secondly, after breaking the Oath, would the Oath still valid or expires after breaking it as this Oath has time limit upto march 2015. Finally, after breaking the Oath first time, it that person do some or all things he listed forbidden in Oath on 2 separate occasions for long period of time, how should he calculate and pay kaffara for that. By writing 100 Oaths of Allah, intention was to make it impossible to commit those sinful things but unfortunately couldn't keep Oaths. According to Hanafi school of thoughts, kaffara for how many Qasams has to be given and how can it be calculated?

Sunnats after zuhr

Q: I started praying the 12 Sunnahs prayer. However, I want to pray four rakats after Dhur and not two because four is recommended. Are the four rakats after Dhur with two tasleems like the four rakats before Dhur?

Rewards from credit cards

Q: You have a fatwa on your website that states using rewards from credit card companies is impermissible (ebucks); is using rewards from a departmental store the same thing if they give you 15% discount when you purchase their products on their credit card? Does it make a difference if the actual funding of the credit card is done through a separate financial institution?

Irregular bleeding

Q: A lady doesn't have a fixed time for her periods. It sometimes comes after a year, sometimes after six months sometimes after 3 months. The days it last for also vary. Sometimes 5 days, sometimes 10 days, sometimes 12 days. How many days does the husband have to wait after it ends before he can have relations with her?