Is a modified house shot just a house shot with more oul?
After bowling a tournament over the weekend that was described as a modified house shot to me, I believe it's just one with a ratio in the middle of a THS and a sport shot.
It was medium length, with a 4:1 ratio. My scores (180, 182, 185) were right in the middle of my house shot average (205) and my sport shot average (167).
So you can think of it as a difficult house shot, or an easy sport shot. You can't spray the ball all over the lane like on a house shot, but you can miss by a board or two and not be punished as harshly as on sport shots.