Controlling row edit drop down choices

On a related item for say an opportunity, there is a drop down Edit option with a down arrow and various options.  See attached.  In this example where the choices are Remove, Copy and Delete, is there a way to remove the Delete option from appearing?   Security does prevent the users from actually deleting the item when they really should be removing it from this opportunity, but it is confusing.  I am pretty certain this isn't controlled through any admin feature, but maybe can be done with javascript?

Thank you.

Mark