Individual isEditable support in has supported both individual (ko.editable(...)) and object-level (ko.makeEditable(target)) editable implementations for some time but the 2 implementations differ slightly. The object-level version supports a per-object isEditable value to enable or disable the beginEdit call but this has previously been absent from the individual implementation.

From version 0.0.25 this is now supported.

var value = ko.editable();
value.isEditable = ko.observable(true); //or ko.computed, or raw value
value.beginEdit(); //has no effect
value.isEditing(); // --> false

As with the object-level version, any one of a raw value, observable value or computed value is supported and will be re-evaluated whenever beginEdit is called.