I am all for improved targeting, but please be realistic with these lines.

They would be going all over the place.

Unit Frames in other games (not just WoW) have special frames called "Player's Target," "Enemy Target," "Target of Target."

Theses show up in small resizeable boxes that show who your party members are attacking, what that mob has targeted, or in general the "target of your mob."

Furthermore, highlighting a name in the unit frames to a special color (maybe red) is a better way to indicate this person has aggro rather than having this awful target line going everywhere.

Not only would these target lines create unnecessary lag, but they would be pretty distracting for something that could be implemented far easier via unit frames.

If these lines do get implemented, please allow turning them off.

A big no to this target-line idea. It works for single player games, not MMOs.