Make it possible to create custom countdown goals
At the moment, when I create a custom goal with a current value of 200 and a target of 10, subsequent data points which are greater than 200 are green instead of red.
Alternative solutions:
the custom-goal creation dialog compares the current value to the target value, if if the current value is greater than the target value, establish it as a countdown goal.
have three custom goals name "Countdown Custom", "Countup Custom", "Flat Custom" [people in weight-maintenance mode will like flat custom"]
I am about to experiment with negative numbers to see if that works.

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Between Two Parks commented
Thanks for the pointer to the Advanced tab on the Settings gadget. This resolves the issue.
I suggest that after a user creates a Custom goal, the system say "You have supplied the basics for a Custom goal. You should check out the Advanced tab on the Settings for this goal to make additional tweaks."
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Admindreeves (Cofounder, Beeminder) commented
If you create a Custom goal now, this should all be possible, albeit confusing! You can set things like the good side of the road in Advanced Settings.
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Between Two Parks commented
Custom goals with negative numbers, e.g. start -200, target -10, results in charts where the green and red are correct, but the rose-colored-dots and purple-swath do not appear (yet).