These are all the individual documents describing each small piece of protocol that can be implemented under the LNURL umbrella. Different wallets and services may implement different sets of protocols.
Open a pull request with your proposal. Pick the next unreserved number for your proposal. To be accepted it just have to be generally decent and make sense and be implemented or currently being implemented by 2 or more wallets.
Join https://t.me/lnurl if you just want to talk about your ideas or chat about LNURL protocols in general.