Quote Originally Posted by RapBreon View Post
Build aggro on head, switch to limbs to help DPS.
Not if you need to keep the part and head away from each other.

That's just an idea I had after 5 minutes, I'm pretty sure a full team of experienced developers can create a lot of bosses with these kind of mechanics

You could also make time kills where the main target has to die around the same time as the last lesser target of a long train. So, killing the main target the fastest is irrelevant.