~Im dreaming for a long time about a RPG where we can assign our own combos to our mousebuttons
everyone could have his own unique fighting style and change it so it feels natural for every player
and as your level increases you unlock different combos/skills to use with those combos

How about the Final Fantasy XII system ? You can assign actions to your party members, optionally adding conditions such as "only heal when health < 50". As you get further, different conditions and actions become available.

~rat / public Wifi account