Given the fact that the vast majority of scps are entities that are alive, mimic life, or produce some sort of life, I think it would make sense to add a formal anomalous life classification system.
Example: SCP-173 would be put in the kingdom of animate, non-organic entities, then a phylum for artificial entities, a class for humanoid animate, non-organic artificial entities, an order for entities like this but are actively hostile towards humans, a family for those of unknown origin, a genus for those traits described above but only vaguely resemble humans, and finally, SCP-173's designation.
I know it's a long shot, but I think something like this on the site would be really neat.