My problem is that RescueTime goals are measuring unproductive time or productive time on the computer, and my goals for computer time each week can vary greatly depending on what's going on in my life. For me, the ratio of unproductive time to productive time would be a more useful measure. Essentially, no matter how many hours I am spending on the computer each week, I don't want more than x% of the time to be unproductive.
Preet Sangha commented
I think this could be extended to the general in the sense that data from 2 services (or 2 data from 1 service) could be combinable as a ratio. Time is a particular one. But other could come up with other combinations.
Mirabai Knight commented
If you implemented this, I might start using RescueTime. Ratios in general would be really nice to have support for. For instance, I currently have two Beeminder goals, one for fruits&vegetables and one for junk food. What I'm really interested in is the ratio; after all, if I fill up on veggies, I'll have less room for junk food, and vice versa. If I could have one goal that let me enter daily data for both and then kept track of the ratio between them, that would be awesome. I'm also a transcriptionist, so I'd love to have a ratio of a job's total audio time to the time it actually took me to transcribe it; that would help me incentivize my efficiency. Wooo, ratios!