At this point do I really need to be poetic and axactly descriptive about just adding more advanced mob ai?Well I'll try...
Target-Allows you to script a specific target for your mob to attack by simply typing in something like if player has history. for example you could make a spider staff that spawns spiders to attack the player that they're fighting
Specific grounds This script will allow you to decide the block that they stand on (or not), So you can make mobs stand on one block forever.
I hope this topic was helpfull.