coalition trade

I dont know why something like this hasnt been added already. I thought it would be cool to be able to trade like normal just in coalition chat that way any one of your members could accept the trade. I feel like it would make things easier. Also I noticed spies cannot pick up msgs from coalition chat. I think it would be cool to have like a coalition HQ in the leaders capital or something like that and if a enemy put a spy there they could pick up msgs from your coalition chat