Allow automatically adding datapoints to more than one goal at a time (esp. if it also allows transformations).

Examples: Work projects for which I want to track the hours worked as both "Hours Worked" and "Hours on Project P". That way I could enter the datapoint in "Hours on Project P" and it would automatically be entered into "Hours Worked"

e.g. #2
Have "Difference in weight" goal (like "chipmanaged's goal here: https://www.beeminder.com/chipmanaged/goals/difference) but that is populated by a transformation of the datapoint entered into the "weight" goal, so that you can enter the datapoint for yourself, but share the "difference" publicly without sharing your weight (without having to remember to enter both points)

I propose something like this (in Advanced settings) for the goal that will receive the datapoints from the user:

Add all datapoints added to this goal to the goal [Dropdown list of goals] [as is (default) / multiplied by / adding / divided by / subtracting] _[user entered value]__

And then the selected goal would also receive the datapoint, either as is or with the transformation.