Well I've played the early access now for 26 hours and, unless I'm missing something, the splitters are not programmable. To be honest the whole logistics side seems very weak. Containers with only one output - you can't designate containers to only release a certain item - you can't specify a limit on items in containers - you can't get splitters to choose items for each exit - there is no sorting/filtering capabilities. All this gives a kind of 'dumbed down' feeling and I will now wait a few months to see if the crux of the game is improved.