Hello exilea.
I don'y have Poser 7. I only upgraded from 4 to 5 when Content Paradise was giving it away. One trick I used to use with Poser 4, and still works with Poser 5 is to put gaps between poses. The following example would be if I had a 15 frame walk.
In the first frame, I would pose the character standing.
In the 5th frame, I would start the pose for walking, which would go from frame 5 to 19.
Next I would make small adjustments to frame 2, 3, and 4
If it messed up my walk, I would apply the walk pose at frame 5 again.
Then I would pose the character standing at 24.
I could then tweek frames 20, 21, 22, and 23.
Then I would repose 24 again, just to make sure it was still correct.
I'm not an artist, just a PC junkie who loves to play with 3D toys.
Please let me know if this helps, so I will know if I should tell others, or keep my mouth shut.
-David