This is a chicken/egg situation.
One side (like you) thought that we needed a tag system and started tagging your RPCs.
The other side (mostly mods) thought the tagging system isn't really necessary since not a lot of authors tag their RPCs appropriately.
However, if you do want to help, you can start adding the appropriate tags on articles 026 to 050 (someone actually volunteered to add tags to these but I don't know if he finished adding the tags, so you'd better check it) and 076 and so on.
The tags are available in the form of "Hazards" in this page along with:
humanoid, visual, tactile, botanical, uncontained, dimensional, reanimation, metamorphic, duplication, aquatic, infohazard
Please note that the added tags are subject to addition.