Your Feature Request / Idea
Alter the "Island navigation" screen to allow switching between Campaign, Challenge and Sandbox modes, and allow players access to any unlocked Las Cinco Muertes maps for use in both Challenge and Sandbox modes. (Three different "universes" if you will).
This would also free up the Isla Nublar map on the Campaign view for any future DLC Campaigns that could potentially take place there.
This is simplest way to add more variety to these modes and next best thing to having a "random island generator" function.
Alter the "Island navigation" screen to allow switching between Campaign, Challenge and Sandbox modes, and allow players access to any unlocked Las Cinco Muertes maps for use in both Challenge and Sandbox modes. (Three different "universes" if you will).
This would also free up the Isla Nublar map on the Campaign view for any future DLC Campaigns that could potentially take place there.
This is simplest way to add more variety to these modes and next best thing to having a "random island generator" function.