Right now request like:

{
"jsonrpc": "2.0",
"params": {
"screenid": "1",
"screenitems": [

{ "resourceid": "6794" }

,

{ "resourceid": "6801" }

,
"name": "My screen"
},
"method": "screen.update",
"auth": "aa90f5246c6b47e43806ae698ddafa80",
"id": 7
}

will make a screen with only item "6794" on (0,0), but it should make screen with all mentioned resourceids in sequence.

In many cases all given items is needed on the screen, without any particular order/etc.