There is a small (or is it big?) bug that you should be aware of. When you edit an enemy's data, changing its speed with PK Hack does not really change its speed. In fact, what happens when you edit that number is that that enemy's movement pattern is changed instead. This is Tomato's fault (don't throw tomatoes at him though), but for now, just don't edit the speed settings. There are only about 12 known values that will work, all other numbers can cause REALLY wacky things to happen, such as:

For those interested, allowed values for movement patterns are listed here.

This bug is easily fixed (within seconds), but we're holding off on releasing new versions until the next big version.