I would like to know if it was possible to set up a cooldown for the use of certain kits after the server has wiped, for example to set a cooldown on the use of premium and VIP kits after the first hours of wipe?

Its in the documentation

  ],
  "Post wipe cooldowns (kit name | seconds)": {
    "ExampleKitName": 3600,
    "OtherKitName": 600
  },​

ok I will test this and does it work with the welcome panel