The real reason unit trades were removed was because of an over powered exploit with planes and ability to trade planes to another player during attack which caused continuous attacking of a target.
Thank you Hastings, didn't know this exploit but this is also solved with the new proposal as "trade mech" would have 24h delay
I doubt Bytro will pursue any such alterations which would complicate the new simplicity of the game> UNLESS... there was a way to that Bytro could make profit from the pursuit.
For Bytro to get some return on their investment, They can enable it for high command only, as they have done with share intelligence.
I would be happy to pay a fee to have this extra option in the game as it is very useful for peace agreements, cooperation and opens more playstyles.