What I want to see is the ability to click a button or run a report that adjusts for a baseline calorie usage.
What a person would need to do is wear the HRM for an average 24 hour period and then set that as the baseline. In this 24 hour period, you would do no exercise.
After this, the report (or the whole website) would show an option to adjust minus baseline. This way, the calculation would not need to be manually figured.
In the future, being able to calculate or enter calories taken in would be an amazing addition.