Today EVA fuel can be refilled by simply entering the capsule. So why not to allow doing it from EVA without entering the vessel? And it's not realistic that nothing is spent to have the backpack fuel refilled. For simplicity, let's use the capsule monopropellant as the EVA fuel. As an alternative, an EVA reserve can be explicitly added to every crewed capsule.

The EVA propellant tank can be improved as well:

• Add an external holder for EVA tanks (one, two or multiple), and allow easily changing them from EVA.
• Allow refilling the tanks when docked to the mount. Don't do it automatically since it may exhaust the valuable monopropellant.
  • The EVA tank can be a true "fuel tank", in which case the stock game functions can be used to move the fuel.
• Allow refilling the backpack fuel form a non-carried EVA tank. Useful when the vessel does not' have a crewed capsule (e.g. a rover with a command seat).

All the behavior above must be controlled with the settings flags. There should be a way to go back to the stock behavior while not disabling the KIS mod functionality.