4. A similar function called "Abandon Vehicle" added to all vehicles, leaving them empty(like when the driver's sniped by Jarmen Kell) so that friendly infantry can get in and capture them if needed.
"This is possible, but I'm not sure it would be very useful."
Since the other proposals aren't viable at all, this is better than nothing; it still offers indirect tech "exchange" with friends by emptying a dozer for your friend to take. It is not just for China/USA exchanges. Seeing how GLA are built(mobile command vehicle able to build workers rather than only buildings producing workers in your mod) they too can exchange tech with their allies.
So how about it?
I think a "Neutron Myself" button would be more of a burdon than a blessing. And i'm nt 100% keen on too much sharing. The generals are each very differnet, but none of them is entirely lacking in any role. they all have AA, artillery, armor, fast attack... While you could share units, every general has a unit capable of fulfilling the same role already.
Tribute truck.. I like that. Instead of having to destroy it to create the crates, why not make it spawn supply crates(like the ones that drop on USA drop pads) every once in a while, and anyone can pick them up? Make them cost as much as a supply pad(maybe more, it's mobile and it can help your allies) and work in the same way or just have it like an ability with a timer.
"Destroy" isn't really the right word.... think of it as "Cash out". you pay 2000$ to build the truck, drive it to your allies base and click "Deliver". the truck is exchanged for 2000$ in money crates. If the truck is intercepted and destroyed it will drop less cash... like 500$ instead of 2000$. This keeps it a clean money exchange from you to your ally.