Hi everyone, the call for aid feature has been turned on. You can find it on the settings page in game.
When you turn on call for aid it will only allow your corporation members or your corporation's allies to join your side of the battle, you will then see a call for aid button during the fight, you can use this to open the battle up to anyone.
Anyone in the battle can call for aid, so if someone joins you and then calls for aid it will open the fight for everyone.
I will be monitoring this over the next few days, if there are any issues or exploits I will turn it off while they are fixed.