A couple things fall under this category:
1. Ability to move the order of the effect in the channel by dragging it up or down. Very basic DAW stuff.
2. Unlimited effects on a channel or buss. Why is the interface limited to 4? Also, number 4 frequently can't be used, it goes dead, so it's really limited to 3 in many cases. This is a bug that I hope is being addressed.