Imagine if it was possible for alliance players to join forces. Fleets of both alliances meeting at a predefined location, and then the battle begins.

Again, this is a suggestion.

A very good idea though. Alliance's can ally with other alliances and use ACS Attack. Make a topic in suggestions for this or ask mods to move it. I think it will get support

Well this was only a thought. I will add it to game suggestions.