[Babul]

sadly, no, you need to define one (or -1 for all) virtual-worlds explicitly to stream an object in. exceptions, like you want, cannot be made (vworlds >5, but not 0,1,2,3,4 and 5).
the streamer CAN handle a large amount of objects, so if you need "only" a few vworlds, then you could create an objects for each single vworld. it will cost only an unnoticeable amount of RAM - and a little more CPU time.