Open 'Dynamic_Localized_Strings' and look for

",
"AUTOTOOLTIP-npc_tractorbeam.odf", "
       Lock on a friendly or neutral target
         with disabled engines to get it towed.
         If a damaged wrackage is under your
         control and is being towed near a yard,
         you may issue a repair order to dock

     Weapon range: Dogfight
",

add beneath it:

",
"AUTOTOOLTIP-npc_warning.odf", "
       Offensive Value
   Defensive Value
       System Value

       Can be modified to transmit any
         required warning message
",