I think a feature you should add to repl.it is mini-modules. Mini-modules will be like modules is python or node.js but you will only be able to access them on repl.it. So if you are planning on creating a module on python you could just apply for your code to be turn into a mini-module and we will be able to test it out and then you could release you module to everyone else. If you still don't understand I will be happy to answer questions. Please upvote this so repl.it developers can see it and add it!