I own the commerzial version of a5... so the multiplayer mode is very new to me.
I looked a little bit at it and there appeared a question:
is it able to let the player make a server, connect to an existing sever or play alone without restarting the engine with other parameters? the player should be able to choose this in the main menu of the game, not with setting different start parameters....
if you know AOE for example... in the menu you can choose between "single player", "Join existing multiplayer game" and "Create new multiplayer game"... I don't know, if I understood something wrong with the multiplayer stuff, but it seems to me, that something like that isn't able to do with a5. you always have to know, if you want to be a server, a client, or a single player at the start of the engine.... that's not good.
ps.: I am a little bit confused since I am able to use the multiplayer mode 
greetings knex