Create user option on all form types

I believe having a create user option on all form types could be a good solution in many cases where you normally would need to first ask user to signup and then fill out some form (could be a simple form or even a CPT form). So let me be a little more specific. In order to optimize conversion rates for certain industries and in many practical use cases, having simple and combined forms is very important. Adding multiple steps or even to big forms becomes a problem and directly hurts the conversion rates. So lets say you have an application form on the webpage. If that user email address is not already registered a user, the user account could be created first after submission and then the application could be linked to the account. In case the email address is a registered users, you could be asked to log in or even just have the option to allow the application linked to that specific account without authentication.