It is vital, in order to track a goal that is worked on through different mediums/platforms, to have the transparency at a sub-category level within the fixed categories built in Rescue time.
I feel it is within your interest to have this in Beeminder.
I'm currently struggling to set a pledge on my abs goal, simply because I use 2 apps to set my daily trainings.
Rescue Time and Beeminder are the perfect combination! Really!!! I don't even want to think of the poor alternative of manual input!

Hope you can make it happen!