Large maps and deadbeating

Is there any way to get the large map to be the default map in a game?
If you kill someone on the third turn, and that person has had there first turn but missed there second, currently you do not get points. Why is this? I thought you had to miss three turns to deadbeat. It is quite fustrating especially when you look at the persons record and see that this was one occasional miss, not a compulsive dead beat.
If you kill someone on the third turn, and that person has had there first turn but missed there second, currently you do not get points. Why is this? I thought you had to miss three turns to deadbeat. It is quite fustrating especially when you look at the persons record and see that this was one occasional miss, not a compulsive dead beat.