Dragon Age 2 Tactics question

As a non native english person - this is not very easy... ( & google "translator" doesn't make this s*** any easier) 

-In tactics; what commands  "set or change a target" and  what commands does not change target but  keeps same target ("conditions on the existing target")

In DA:O commands that "set or change a target" are:  (or at least wiki says so & nexus/"advanced tactics"- mod too)

  >>Enemy:Status /-Lowest/Highest Health /-Clustered /-Nearest Visible Class /-Target of Party Member

AND commands that does not change target are: (...conditions on the existing target)

  >>Enemy:Any /-Health /-Has armour type /-Target At Range /-Target Using Attack Type /-Rank (in DA:O note'rank' patch chance)

...( Yes, i know dog=ally (c/o some 'if "ally" something'  commands, etc)

Also behavior matters. Is it same as in DAO or different (...at least there are more idle in da2 (ie. passive...whee, look, i can spin a staff - "tactics?" ...hmmm, whee, ...))

...(ok, if it is same as dao, why i can't control npc's like i can do in dao?)