This is a neat idea but would require so many settings and questions to pester you with when you set the goal up. It wouldn’t be possible for the road to know whether you needed to dial something back by 1, say with a goal of “Eat x pieces of fruit per day” or by 10, like with a goal of “Read 75 pages per day”, where reducing by 1 would be inconsequential.
If you poke around, I have an autodialer that I use on a few of my goals and the rate gets auto-set by how much I’ve actually been doing. ( Just do better ) It works in both directions, though. If you take a long break (or derail with some mercy days) it’ll dial down a bit (after the akrasia horizon) and if you do way better than you planned, it’ll dial upwards.
I have to admit that I haven’t looked at that post or the files related to it in a long time and so I can’t swear they still work as is but the one I’m using that was basically the same still does and I use it almost daily. If you’re interested, though, we could chat it out!