The misc tab has some additional options.
Use global settings - Uses the Options -> Server regain nick settings.
On - Tries to regain nick if the main nick name is in use.
Off - Disables regain nick on this network,
Asks the servers to set the entered user modes on connect.
If set, commands such as /ban will use this format as the default ban type on this network.
If enabled, uses global quit message settings including random quit message, otherwise uses the message entered in Quit message
The custom quit message to use on this network if Use global quit message is disabled.