The cooldown: tag has now been added to add per portal cooldowns (these will not be saved between server restarts) as well as leavedesti: has been added.

cooldown: how long before a player can re-enter the same portal in seconds
leavedesti: when the player gets moved to another bungee server where to move the player to on the original server.

I will add these to the documentation when I can but that will have to be in a few weeks after exams.