Can you look into making crates that are dropped into water bouyant?  Perhaps an optional setting?  That is, perhaps the 'Underwater Labs' want their crates to sink making for easy pickup by their divers.

Also, it would be nice if you allowed for the invers of 'Don't drop above monuments'.  That is, ONLY allow dropping over the enabled monuments in the list provided.  I suppose Rust has the coordinates of all monuments so I'd randomly select a monument and then randomly select a poing within the radius specified for that momument.