I have this set, and I love it. Being the O.C. dummy I am, I went to work on fixing this set.
1) Like everyone, I filed down the head/back connector. It now "clip lock's" into place.
2) The fingers.

I took them all off, and indiviually added superglue in small amounts to the bars that connect the fingers. Now, they all move, are super tight, and don't fall off, so things like <pic related> can be done with the greatest of ease.

3)Bonecrusher's peg wasn't big enough to hold the arm. Again, with super glue, put a small amount in the joint, and worked it back and forth until dry. now it holds pretty much any pose.
4) Waist Cover: had to file down the one side, because the flaps were un-even.. dont know if that was an issue, but whatevs.
5)Finally, the leg piece was loose in Longhaul.So, once again, superglued that mother up.
All in all, easy mods that make the figure more stable and easier to play with.
I do plan on making some heels for dev, because even though he can stand, a light breeze can come through and screw the pooch.