In some RTS games you are able to transfer some of your resources to your ally, like in Warcraft 3. I'm not sure in which other games you could transfer aswell, as I don't play much RTS games these days. Also, I'm not sure if resource transferring existed in older C&C titles, forgive me for that.
Do you think Generals 2 should have resource transferring? Or do you want it exclusively for singleplayer of multiplayer? It will give more unique ways to play in multiplayer matches. For example if your ally is in a desperate situation where he can't afford a MCV anymore, your ally could give you some resources and you'll be back on track.
Also, not every match has to have recourse transferring. There could be an option to turn it off if people prefer it that way.