If I’m understanding your request, this already exists. Assuming you’re referring to SD card recording… the SD card recording does not observe the detection zone. Therefore, if you set a detection zone that on the door, you should get alerts only for that area, but still record all motion on the card (in Event Only mode).
Another alternative is to set the card for continuous recording. However, I understand that makes it hard to find time segments of interest. Here are two Roadmap topics that you might want to go vote for that will help with that. (You must click the VOTE button on each for your vote to count.)