Vanilla OXCE allows you to re-order craft positions by going to the UFOPaedia > Craft and armament > Skyranger (or any craft) > Preview > select soldier, press ctrl + w, then abort mission to save the layout.
This order is not persisted. I tested by changing the position ordering on the host, saving, then opening the position ordering on the client and it was still the default. I didn't go as far as testing what happens when you enter a mission, but I suspect it will go with whatever the host's ordering is. This is somewhat low-priority, but it should be persisted so that any player can see the current ordering and modify the order and have it be persisted/applied. This should probably come very shortly after #125 so that players can re-order craft positions to make the "alternate" button work as intended for any craft (vanilla or modded).
Vanilla OXCE allows you to re-order craft positions by going to the UFOPaedia > Craft and armament > Skyranger (or any craft) > Preview > select soldier, press ctrl + w, then abort mission to save the layout.
This order is not persisted. I tested by changing the position ordering on the host, saving, then opening the position ordering on the client and it was still the default. I didn't go as far as testing what happens when you enter a mission, but I suspect it will go with whatever the host's ordering is. This is somewhat low-priority, but it should be persisted so that any player can see the current ordering and modify the order and have it be persisted/applied. This should probably come very shortly after #125 so that players can re-order craft positions to make the "alternate" button work as intended for any craft (vanilla or modded).