Whatever happened to Captain's discretion?If in the opinion of the Captain,the approach and landing can be continued taking into account all relevant factors(incl very importantly PF's abilities) then sobeit.The 1000' IMC and 500' VMC rules are there and are good rules of thumb but they should never supercede a Captains judgement.An airline that utilizes approach monitoring equipment to ensure that its pilots are held to these rules of thumb treads a dangerous path.We live in a world where todays pilots sometimes sweat at the thought of taking out all the automatics at 10000'...we dont want to exacerbate things by taking away his/her right to cognitive decision-making.Condition a pilot too often to rule-based thinking and pretty soon thats all you will get..an emasculated automaton.