Ironically, download status of mods is being shown in the dedicated server console. But when players try to join a Modded Server the client simply 'freezes' while it's downloading/installing mods. A good thing would be to add an indicater or a progress bar whether mods are being downloaded/installed so the player doesn't think their game has crashed and closes it and never joins again.
If this is the wrong section, please move the topic.