Grouping armies between allied

Hello all,

I have an idea for alliances game. Why not add a option to gather an army of Blue player and Red player. For example, why not red player can add its units to a blue player (with a window for confirm this). When the red player put "yes", the red army is given to blue.

This is function only for alliance game i think.

I do not support this. People who late join would just join in ally his friend has the 500+ units he got and boom!