Not bad
Typically tutes on NG suck, but this one isn't too bad. Couple of suggestions though -
1) When making a custom pointer, make the point (in your case the very tip of the black triangle) the registration point of the movie clip. That way when the clip follows the hidden mouse, the user is clicking with the part of the mouse that it looks like it should and not the middle of the traingle, as in your movie.
2) Add an updateAfterEvent() to your custom cursor, it will make it a lot smoother.
3) Why did you use a startDrag for the custom mouse? You already figured out the better way - setting the clip location to the mosue location (and then add my suggestion in #2) startDrag is a crappy way to do it.
4) If you're gonna add code, make it readable. use scroll panes.
Typically, I don't think tutes belong on NG, because they dissapear after they leave the top 50. People don't come here for tutes, they come here for games and movies. They go to places like flashkit, actionscript-org, macromedia, ultrashock, etc. for tutes. Keep in mind the purpose of NG when submitting content and also keep in mind that anything that passes the portal has to get stored forever and ever. The more NG has to store, the more it costs them to store it, and the harder it gets for Tom and Wade to keep this site free.
Aim to knock peoples' socks off with your work, not just to get onto NG so you can say you passes judgement.
All the best.