Thanks for the suggestion. I have considered adding a player limit to be set by the map creator, or even automatically suggesting a player count, but I found these to be unreliable measures.
It's hard to tell when a map gets "too" chaotic, as some players may enjoy it when others don't. In my best belief, I thought it best to let the players experiment by themselves.
In later versions, there will be an option to quickly add/remove bots during matches.