Creep Aggro and Position in interface

[ThaAthael]

Hi folks!

I'm stuck again with some stuff.. I want a player to have his/her selected hero in the bar on the first place (selected by default, even when own creeps are selected too), but at the same time a hero usually should be the unit that is attacked at last.
I know that I can increase or decrease both aggro and position in interfave by changing the priority.. unfortunately, when one goes up, the other does too...
Have I missed another parameter I could play with to change this behaviour or is there a simple way to trigger this stuff?

As usual, +rep & credits for help

 

[Kino]

Units with heavy heavy type armour for some reason are always first to be attacked.