I don't often try to quantify it, and sure that I would be pretty inaccurate if I did. I make drinks that would put my poor mother on her arse. Would such a drink be worthy of the "Caution" label?
If all pills were lab tested, then I could see that a 300mg pill is sufficiently strong that it could warrant a different, higher rating than just "strong". Mind you, I don't know what the current guidelines are- are they given in terms of dose, or do users simply choose one? There seems to be quite a lot of argument over which label is most appropriate as is, I can see people bitching/flaming/accusing others of shilling if this label was introduced, because not all pills are lab tested. So, we are left either with a system in which any user is totally free to attach a "caution- high dose" label to a pill, or we are left with only lab-tested pills having it, which is unsatisfactory, to me, because then pill A might have the label and pill B not, when they are equipotent, but A has been quantitatively analysed and B has not, and that feels arbitrary and lacking rigour, to me. However, as it is, users are free to label any pill "adulterated", and that system seems to operate just fine (from outside, obviously you are better informed on that matter), so perhaps it will run fine. My gut feeling is just that it's going to be tricky to implement, but that's why these things get discussed.