In a Custom Game your K/D stats wouldn't change and bounties and quests can't be completed, so there's no way someone would create a match just to do things like that. Additionaly, when creating your game, you can chose the mode you want to play (Control, Rift...), the time that abilities and supers takes to recharge, the time for special and heavy ammo to spawn and how many players could join. Then you can just. Have. Fun. With your friends. The option to make the "room" public, so others players could join, others than your friends, would be cool too. *Sorry for my possible bad english.