Most of the time, that additional goal would sit calmly near the bottom of the list. You’d automate the data entry via IFTTT, so no additional hassle as a goal. But it might be a good canary-in-the-coal-mine goal to warn you that you’ve started neglecting Beeminder.
Although I’ve not done that, using Beeminder to mind Beeminder, I certainly have a lot of meta-goals that make sure that I don’t forget about other systems: GTD, Complice, Gmail x 3, OmniFocus, etc.
If the warning emails are getting a bit much, you can change those settings. Both the reminder start time and the number of days. I’d probably go crazy if I got daily reminders about my blue/orange goals. What’s more, I’ve set my zeno reminder start time to the afternoon, so that if I get an eep! email, I really have to take it seriously.