I added AI to the behavior. You can set a destination point and the object will move randomly towards it. I also made a demo(demo2 in first post) which shows a black box moving to colored squares labeled with numbers. The black square moves from 1 to 2 to 3 to 4 in that order. let me know if there is any bugs.
I have a update which might fix the problem since i could not duplicate your problem. Download the plugin again and try it again.
As for removing diagonals from the behavior directions of up, down, right, left. I was trying to make the movement random and sporadic. I will add more behavior directions that will include what you want.