Why single file upload only?
 

When you try to upload a model on here you can only select a single .cub file. I know you can just make it a .rar file but it seems like a hassle. Is there a technical reason that i dont understand?

It's standard practice to have authors compress their files into a single zip folder. It's actually easier on users. :)

I prefer .rar as well but I suggest to use .zip because it will be easier to import your modded files with tools like CWLP. (only supports. zip right now).