PES 2009 had "Star Cards" (precursors to Player IDs). An editor can give your Center Back the "Goal Poacher" star, causing them to make runs into the box. You can give a Goalkeeper the "Long Throw" card.
The editor carved a rift in the PES community. Pes 2009 Become A Legend Editor
PES 2009 introduced "Star" abilities (e.g., Dribbling, Tactical Dribble, Reaction, Passing, Scoring). In the base game, you had to earn these over years. The editor let you toggle them on immediately. Want your youth player to have "Playmaker" and "1-on-1 Scoring" from day one? Check the boxes. PES 2009 had "Star Cards" (precursors to Player IDs)
Nothing is worse than playing 40 matches, scoring 25 goals, and then watching your digital avatar fracture his tibia in a meaningless cup match because the game rolled a hidden "injury resistance" dice. Editors allow you to set injury resistance to a permanent "A" (Very High). The editor carved a rift in the PES community