one crosshair looks like it could be only used on grenade launchers or even tanks.
But other than that I think that unturned should have a crosshair customization in 4x especially if its gonna be 3rd person.
I think some crosshairs should be available to customize for your character.
But some crosshairs should be based on different weapons like grenade launchers or throwables(grenades, flashbangs, smoke grenades).
I believe what is currently planned is that crosshairs will be specific to the type of weapon your using, (i.e. shotguns have a different style crosshair than pistols) and I feel that would be far more useful than one custom crosshair that is used across the board. If you could have a custom crosshair for each weapon however, it could be fine.
Maybe we could go a bit deeper and make it so there are little variations of each variation of the gun sight/scope? Just to add that little bit of flair to the things you can find.