option to limit entering certain values for a goal - no stacking
Some goals should not be allowed to enter more than 1 point/day (i.e. the graph can't increase by more than a value of 1 per day). Otherwise, I can "stack" a lot of points in one day to get really ahead of the yellow brick road, and then slack off for many days. I would be missing out on creating a daily habit by just "cramming" at the end. I've had to amend many of my goals to add a "no stacking" clause for this reason but it would be nice if that type of goal was supported out of the box.

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Admindreeves (Cofounder, Beeminder) commented
Smart. One answer to this is to use the "automatically trim safety buffer" checkbox, currently a premium feature. Will keep thinking about this.
One consideration is that we always want Beeminder to be foremost a Quantified Self tool. So if you actually did more than 1 point (or whatever) on that day then the graph should absolutely reflect it. It should be a meaningful graph of real-world data, in other words. I really hate it when people have fine print that conflicts with that. (The worst is fine print that says they can add a "1" under certain exceptional circumstances where a "1" did not in fact happen.)