Disabling ActivityStream on a specific module (Accounts) and global logic hooks that support functionality.

rmas.ext.php

<?php

/* File: ./custom/Extension/modules/<Module>/Ext/Vardefs */

	$dictionary['Account']['activity_enabled'] = false;
	
?>

rmashooks.ext.php

<?php

/* File: ./custom/Extension/application/Ext/LogicHooks/rmashooks.ext.php */

$hook_types = array(
	'after_save',
	'after_delete',
	'after_undelete',
	'after_relationship_add',
	'after_relationship_delete'
);

foreach ($hook_types as $hook_type)
{
	if(isset($hook_array[$hook_type]))
	{
		foreach ($hook_array[$hook_type] as $key => $hook) 
		{
			if(in_array("activitystream", $hook))
			unset($hook_array[$hook_type][$key]);
		}
	}

}

?>