In Europe we work in 25fps so the go forward 10 frames and go back 10 frames is not so good if you want to set 1 second keyframes for fades etc.
(thus 1 second advance = ahead shift page up twice then page down 5 times).
In NTSC 30fps you can press it 3 times to get your 30 frame advance.
Why not make this a preference we can set in the project? Then we could quickly apply keyframes at uniform frequency!