Thanks, the Property with conditional flag works well with "
GetVmScriptVariable" 
Also, it looks like you've attached a script directly to the player reference. Don't do that - use a http://www.creationkit.com/ReferenceAlias_Script instead.
Cipscis
Yes, i did that because i'm not sure how to use RefAlias. Tell me if this is right:
1- I create a quest (duplicate, if i create a quest CK crashes on "ok") with a ReferenceAlias (with an assigned script "_PlayerExt") on the Player Reference.
2- I assure that the quest start and run, since the game is loaded (i failed here, and decided for Assigning the script on the player Reference
3- When i've to use something on the _playerExt, how can i reach that, instead of "game.getplayer() as _playerExt"?
What are the side effects of attaching a script to the player ref? It will not work, or just compatibility issue with any other mod that changes player ref?