What is total supply of the OIO tokens,and what you plan to do in case you dont sell all of them?
Supply is 2,500,000,000 tokens and everything that is left will be burned which is good.
Standard practice for projects.
Is there a way that those unsold tokens would not be burned but used in developing the projects further?
Sure there is,sometimes teams choose to use unsold tokens later on ,for something like marketing or giveaway,but often that was abused,so burning unsold tokens proved to be easiest way to deal with that.