I often recall flight plans that I created a month ago. When you recall a flight plan the date for take off is always when it was last saved. It would be really useful to have the default date and time as now rather than in the past

That is not the case at all. The date/time for takeoff is exactly what you set it to, if you set it at all. If you haven't set it (normally the case) then it is assumed to be "right now". The date when you saved the route has nothing to do with it.