formtool array rendertype=list cannot be unselected

Once you select a value you cannot unselect the field. Need the option to cancel any selection.

For example, with farPermission:

<cfproperty
name="aRelatedtypes" type="array" default="" hint="If this permission is item-specific set this field to the types that it can be applied to"
ftSeq="3" ftFieldset="General Details" ftLabel="Bind Permission"
fthint="Permissions can be bound to a specific content type. Set this field to nominate the types it can be applied to. Only those types capable of being bound are shown."
ftType="array" ftJoin="farPermission" ftRenderType="list" ftLibraryData="getRelatedTypeList" ftShowLibraryLink="false" />

The new UI makes it impossible to create a permission without a join on Navigation as the field cannot be unselected once selected for. And the Role attribution field is broken in that it never highlights existing relationships ie. its always blank when you edit regardless of the actual values.