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I was surprised to find that I couldn't set the "CheckBox" mode setting (which affects the selection drop down) independently from the other mode settings ("Default", "Box", "Delimiter") which all affect the visualisation of the selected items. To my mind CheckBox is affecting a different aspect of the control (i.e. the drop down) to the other mode settings (which are affecting the visualisation of the selected items).
You could introduce an enableSelectionCheckbox property or similar and then retain legacy support for mode being set to "CheckBox" which would basically behave as if the mode were "Delimiter" and "enableSelectionCheckbox" were enabled.
Related to this I noticed that the "valueTemplate" property only applies when mode is "Box" (i.e. not when mode is "Delimiter" - the API documentation doesn't mention that this is the case.