ManualAddingOfItems=disable, auto mode, ''choose source" appear
if you want to human priorisation on the article displayed, in your Lastcontent_fetcher class order by 'priority', but it doesn't work by the last published.
it's a bug that we can't change the priority when the items ware published. I think the next version will fix it.
If you really want for now, i have a patch
see it : http://ez.no/developer/forum/extensions/ez_flow/change_the_priority_in_the_list_valid_of_block_manual