Merseyrail stations are officially staffed from start to end of service with exceptions beyond Hooton, but certain stations do go unstaffed with regularity. Wallasey Village is one example, whereas of other regular haunts, Brunswick, St Michaels and Blundellsands are very rarely unstaffed in my experience.
What would be interesting to know is how safe the unstaffed stations beyond Hooton are by comparison. Overpool, in an area as rough as the windblown sand, feels threatening and scallies abound at times, although I've never witnessed anything beyond rowdy behaviour there.