koreader/extensions/kpdf/menu.json

{
	"items": [
		{
		"name": "KPDF",
		"priority": 0,
		"items": [
			{"name": "Start in documents", "priority": 1, "action": "/mnt/us/kindlepdfviewer/kpdf.sh", "params": "/mnt/us/documents"},
			{"name": "Open last document", "priority": 2, "action": "/mnt/us/kindlepdfviewer/kpdf.sh"}
		]
		}
	]
}