• place Mi-48 Kajman with crew in editor
• as pilot, enable manual fire to see what armament/ammo type is default

(default in Kajman when you get in is HE 30 mm, then comes APDS 30 mm, laser marker, Scalpel and Skyfire)

• cancel manual fire
• press CTRL+F to order the gunner to switch to next available armament/ammo type
• in the chat, you see you ordered him to switch to APDS
• enable manual fire
• it's still HE
• cancel manual fire
• order the gunner again via CTRL+F to switch to next available armament/ammo type
• it orders the AI gunner once again to switch to current APDS (still HE), instead of switching to next available armament/ammo type

(you need to press CTRL+F twice so it cycles to laser marker)

• cycle via CTRL+F through all available armament/ammo type until you see the order for AI gunner to switch to HE
• switch to manual fire
• it's now the opposite, it's actually APDS, despite the order saying it's HE

So when you enable manual fire, you can without problems, with only one F click, switch from default HE to APDS and also switching to APDS, without switching from HE directly to laser marker.