halacha - Can 'cruelty to animals' render an animal not kosher?

The problem of cruelty to animals is rife in the food production industry. This article brings the reasoning of two Rabbanim to forbid foie gras and veal on these grounds:

Some of the greatest halachic authorities of modern times such as Rabbi Moshe Feinstein and Rabbi Haim David Halevy, both of blessed memory, declared foie gras (goose liver produced by force feeding geese) and veal (the anemic flesh of a calf, denied light and movement) to be prohibited, as their production egregiously transgresses the Jewish prohibition of za’ar baalei hayim, causing cruelty to animals that is not essential for human consumption.

1. 
   

   To what extent do kashrut authorities take this in to consideration?

   
   


2. 
   

   Is this regulated in the kashrut market?

   
   
   


3. 
   

   Does the animal become forbidden because of cruelty or is it that you are facilitating it by buying that animal?

   
   


4. 
   

   Is there indeed a 'threshold for cruelty' beyond which an animal would be considered non permissible to eat?

   
   

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UPDATE: An article by Rabbi Slifkin was written on this topic called 'How Frum Is Your Food'.