HABTM merge with current values

I Have a HABTM relationship.

Listing HABTM User

Listing belongsto User

• User can create listings, so the lists are owned by them, but also can assign those lists to another users.
• Users have access to lists created by them, or assigned by their parents.
• The system is recursive. A user can assign a list to its children users. So the children users can assign the same list assined to them to its chieldren and so on.
  
• 'unique' index in habtm is currently set to 'keepExisting'

The problem is, the listing edit form displays only available listings for current user, so as i'm using habtm and habtm erases the content of related table that is not submited by the form and the form does not display the lists assigned to another users, everytime a users submit and update to the listing, all other users lose access to this listing, even if this listing was assigned by another user or the user is not in the same user tree.

The behaviour I was expecting was: The habtm delete the fields not checked in the form, but keep the fields not present in the form.

I probably need to set it to true, so the values will be erased and merge the selected values in the form with the ones already present in the habtm association table (listings_users) that i could retrieve with a find, but i couldnt figure out how to write that in a "cake" way.

2.x Manual:

unique: boolean or string keepExisting.

If true (default value) cake will first delete existing relationship records in the foreign keys table before inserting new ones. Existing associations need to be passed again when updating.

When false, cake will insert the relationship record, and that no join records are deleted during a save operation.

When set to keepExisting, the behavior is similar to true, but existing associations are not deleted.

PS: I created the model named listing, because list is a php reserved word.

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