enable me to mark start and end of an activity associated with a tag

To decrease noise I use a whitelist. I am pretty sure that "non white list activity" in the dashboard is the result of me browsing random blogs. I don't want to ignore that in the report and I don't want to turn off the whitelist because that would increase the noise.

I want to be able to mark the beginning and end of this activity while I'm doing it. I realize this defeats the entire purpose of RescueTime since it monitors me silently but having a large block of time as "non white list activity" is not useful data to me, the user.