I’m becoming more convinced that tricks akin to setting your clock 5 minutes fast are wrong for Beeminder. Beeminder should always be brutally honest with you. And what if you get used to banked safety buffer and lose that feeling of alarm from a red graph, and then find yourself with a red graph without banked buffer? Consistency is key!
I think better is to just cultivate your sense of alarm at seeing an orange or blue graph. Or a graph with less than a 7-day buffer (where it shows the day of the week instead of number of days on the graph image).
Pro tip: if you always have 7d of buffer then you can always flatten your road in case of emergency (or change of priorities) with zero notice and be safe from derailing.