Anchorhead said:
We’re working on it currently with either a graph or a list similar to your suggestion. Regarding surplus money, I’m always going to want to push any extra dollars into the next available month’s payment. That won’t be solely my decision though. If we were to really need a patch or upgrade, we can handle that as needed.

In my opinion, you should build up a pretty big buffer, I would say as much as three years, before you consider slowing down the donation effort. Then you could start it up again when the buffer dips below 1 year’s expenses