I think it would be nice if they added some kind of coin-flipping NPC or command (Like /cf or /coinflip) to the skyblock lobby. They could add an NPC and when you click on it it opens a GUI where you can see all the active coin flips and where you can add your own coin flip.
I have made this thread to help some players out and give some information about the game.
How to invite someone to your island. (you must be the owner of the island)
Click on the skyblock menu in the far right or 9th hot bar slot.
Click on the Profiles button.