Often, you're moving a clip, and you have it just where you want it, and you remove your finger, and it moves slightly. A couple of suggestions on this:
1. Make it so that if the user holds a clip in place for more than two seconds, it locks the clip there unless there's intentional movement in another direction from the user. however, then you need to set a "locking point" and quantify "intentional movement" from the user. OR;
2. do a multi-touch command, such as double tapping with another finger to designate a lock in movement, then even if the user moves their hand slightly when removing it, it doesn't matter.
Just a thought...
