Not for the first time I am a little confused

I have a combobox with autocomplete settings set to SuggestAppend. However, the "append" part of the functionality doesn't work unless IgnoreManageReadOnlyState is set to true. However, setting this property to true obviously means the combobox is not enabled/disabled based on the BO editingstate. If IgnoreManageReadOnlyState is set to false (the default state and in my case the desired state) then the append functionality stops working.

It would be great if it was possible to have the append functionality without needing IgnoreManageReadOnlyState to true.

Thanks

Aaron