Auto Invite
Get over the issue of constantly asking "inv", "inv", "inv" in your guild chats to switch parties. Enable this so whenever a player whispers you "hop" they are automatically invited into your party.
Usage
1) Automatically enabled. Tell your friends to message you "hop".
2) When they message you they will see a message "[Notice]: If you don't get an invite then YOUR_NAME's party is full."
3) A message will post to your party: "[Hopping] PLAYER_NAME is just visiting."
4) /hopinviter and /hopper will enable or disable.