Hi,

select multiple delivery and in a wizard you can confirm your selection or choose operation check the availability or deliver or another actions.

so

add a menu in "More":

<act_window name="Select multiple delivery to  deliver" 
            res_model="multiple_delivery_wizard"
            src_model="stock.picking.out"
            key2="client_action_multi"                  
            view_mode="form" 
            target="new" 
            view_type="form"
           id="act_more_select_multiple_delivery" />

in wizard :

class multiple_delivery_wizard(osv.osv_memory):
    _name = 'multiple_delivery_wizard'
    _description = 'multiple_delivery_wizard '

    def default_get(self, cr, uid, fields, context=None):
       res = super(multiple_delivery_wizard, self).default_get(cr, uid, fields,
          context=context)
       delivery_ids = context and context.get('active_ids') or []
       # all delivery selected
       # your treatment

    def view_init(self, cr, uid, fields_list, context=None):
        """
         Creates view dynamically and adding fields at runtime.
         @param self: The object pointer.
         @param cr: A database cursor
         @param uid: ID of the user currently logged in
         @param context: A standard dictionary
         @return: New arch of view with new columns.
         """
         # your treatment

   def delivery_all_selected(self, cr, uid, ids, context=None):
         # your treatment



  multiple_delivery_wizard()

Thanks

Another way to batch processing delivery orders is in "Warehouse/Receive Deliver Products/Deliver Products": select all lines and continue with "More Menu" option "Deliver/Receive Products"