Roles and hardcoded behaviour

[johnnyyakuza78]

A post I spotted elsewhere raised a question in my head:

Now I've known for quite some time that there are some roles that have hard coded behaviour attached to them that means they aren't just a selection of PI that are baked in, meaning as above, selecting 'roam' on a CM/S isn't the same as a BBM (actually I didn't know that tbh)

As a long time FM and CM player the way I thought about it was like in the good old days where you could select 'targetman' or 'playmaker' to a player and that would mean the ball was drawn to them in certain ways. 

My question is, what other hard coded behaviour is attached to roles that isn't just a consequence of a role being the culmination of position and selected PIs?

The big one I can think of is the HB that moves into defence and pushes apart the centre backs a bit. Apart from that I wasn't aware of too many others.