Yes Cooldown indicator for the Ludicrous Speed Drive (sco) is needed. And also Mass Lock for when leaving the surface of planets, SCO (Ludicrous Speed Drive) sometimes works and sometimes not for me when leaving a planets surface saying 'Mass locked' but the mass lock light is not on
This would be particularly useful because it's quite clear that the cooldown time is not the same for all ships (particularly, in the newer ships it's much shorter than the old ships. Not surprising, but it would actually be nice to see it.)