It would be rather difficult & you'll need practice. Rapping takes a certain amount of breath as does screaming. It'd be difficult to scream fast rapping words if you know what I'm trying to say.
Yes it it. Try listening to Mary Magdalan. (She's not screaming all the time, but she makes it sound cool)
it is possible. try listening to crunk screamo bands..such as Brokencyde
Anythings possible when you put your mind to it :)
U cud but I don't think it wud snd to good