Contextual Filter Exceptions (Multiple Values or User Role) -- possible view_query_alter()

HI

got round this by adding an exception for the admin user ID.
But this isnt very scaleable, what if i have multiple admin users.

Were you able to find a solution.
I am so far able to gather the required ids (to be added as exceptions) in an array as well as comma separated values.
But, I am not able to add these to the exceptions part.

$users = entity_load('user');
$user_names = array(); //empty array
foreach ($users as $user) {
    //dpm($user);
    //Check if the current logged-in user has any of the below roles
    if(in_array('administrator', $user->roles) || in_array('Company Staff', $user->roles)) {
      $user_names[] = $user->uid;
    }
  }

$commaList = implode(', ', $user_names);
//$user_names: array of needed UIDs
//$commaList: Comma separated value of needed UIDs

Am I supposed to write this code in one of views hooks, because, I am not able to alter the output so far.

I got this working with proper permissions & views itself.

Permissions (for a given content-type)
Administrator & Staff - Edit ANY content
Normal Member - Edit OWN content

Views
Contextual Filter - Content: Author UID

WHEN THE FILTER VALUE IS NOT AVAILABLE
- Provide default value: Type - "User ID from Logged in User"

WHEN THE FILTER VALUE IS AVAILABLE OR A DEFAULT IS PROVIDED
- Specify validation criteria: Validator - "USER"
- Type of user filter value to allow - "Only allow numeric UIDs"
- Restrict user based on role: Restrict to the selected roles - SELECT the role who can only edit his own content
- Action to take if filter value does not validate - "Display All Results for the specified data" [important]

The last step (marked important), makes all the data (view results) available to other users, who have access to edit any content.

NOTE: Not sure, if this was your exact requirement, but this is one way to have that Contextual Filter multiple EXCLUDE or add have an contextual filter exclude user roles functionality.

Hope this helps