FateHub includes an action option on join items and menus. Actions are not commands but things that run methods within FateHub. Below is the full list of possibilities.
Action List
{openmenu:menu-name}
Opens the specific menu defined by the user in the menus.yml.
{bungeesend:ServerName}
Sends the clicking player to the specified server directly. (no queue)
{playerbalancer:ServerName}
Sends the clicking player to the specified section from PlayerBalancer.