Hi Nico, this is possible in TBC, but I'm not sure if that's the best way to process the data. Imagine this scenario, you have several scan stations. The point clouds will be imported and sit on top of each other. When they enter TBC, they are all in the Default region. If you classify them altogether, the result would be very bad because building walls can all be tilted or misaligned. If you classify them one by one, that takes quite some time and the result can be bad as well, because one scan may only captures a small portion of a wall, and TBC doesn't know if it should be classified as a building or a tree trunk. Under this circumstance, it makes more sense to classify the point cloud after you align/register all of them.
As for the registration accuracy, TBC doesn't get much influence from noise or ghosting points. It tries to use large chunk of planes to do the registration. Therefore, even if it's a busy road with cars in it, it doesn't impact the result. As for the overlap percentage, it's not very accurate in many cases. I would absolutely trust the visual inspection more than that value.
Let me know if this makes sense. Thank you.