separator and disable item in GtkTreeView

Title: Message
hi, all
2 questions:
1)is there a way to insert a seperator in the GtkTreeView, like . if no, will it be included in the coming feature and when?
on line friends -- separator, left alignment with icon column
icon1  anderson
icon2  smith
off line friends -- separator 
icon1  oracle
icon2  tank
2)is it possibel to disable an item, and once navigate in the view, focuse will not on the item and switch between above and below one?
many thanks in advance and merry chrismas,

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