not at all. once we get entity information, its just a matter of pulling mob data out of the entity manager, and facing/moving toward the mob based on its location and yours.
the only thing different about botting in tera, is that you will have to code some rudimentary aimbot for targeting, but nothing special.
all in all, not a very daunting task, its just a matter of time before someone like h4x0r fully unpacks the TERA.exe's and we can start getting more usefull offset information.