Every one of your units is kept at full health, even ones you are not controlling. Not in first person: use Single Unit Health there.

Every one of your units is kept at full energy and fuel. Not in first person.

The health of the unit you are playing as, first person included.

The energy and fuel of the vehicle you are playing as.

The weapon of the unit you control is kept full.

Ammo for the other weapons (bombs and the like) that Unlimited Ammo doesn't cover.

Weapons never overheat, so you can keep firing.

Open the carrier's repair window with this on to repair every system, or with the window open click a system to set it to top priority and repair it at once. Turn it off when done, or everything is repaired again the next time you open the window.

Your carrier's fuel is held at 100.

The enemy carrier's fuel is set to 0.

Open the production window, select the item, hover the mouse over it, then turn this on: the item's stock on your carrier is set to the quantity here. You need at least one of the item stocked (or to have had one before).

Materials are kept at 14,950.

Turn on, then open the carrier's production window: production finishes at once. It can be turned off after that.