Mods are for making Arcade modes only. But these modes you can pretty much do anything you like. For example you can create your own map where you and some friends can just explore it. You can make your own gamemode like our examples Hide and Seek/Trash Zone Example
We highly recommend you to join our Discord and ask for help there.
Currently no, we hope to change this soon
Yes but once again only in Arcade modes. We don't have many examples right now but if you look into our Trash Zone Example there should be an example of this there.
Note: Clothes do not save once you leave Arcade.
No, these mod tools are only for Arcade.