For the ones you need the journal for I was referring to things like ore blocks, they require 144 of the chemical to make in one slot but are much more energy efficient than making ingots. It won't let you input a value over 64 in one slot manually.
I take you haven't tried turning a polytool into a weapon yet though? Because some of the stuff like AoE wither is pretty hefty in combat, plus it has the distinct advantage of being able to see every potential effect and what causes it just my searching polytool in NEI.
Leaving poisoned food around on a server would be pretty nasty, particularly if you put multiple effects on it (that's possible right?)
There's no good wiki for minechem unfortunately, but outside of the weak documentation on what the fusion/fission reactors do and how to get them, the NEI stuff, and the basics of the machines/journal it's only the effect list that's missing. I've looked in the code and this is what I found, as far as I can tell outside of hunger restoration and curealls everything should have the same effect with you eating it as hitting an enemy with it. Those two are player only.
Anyway
the big list of chemicals and effects, I can format it better if you have any ideas but I put it in a pastebin and just use a find feature to look for them. The potion effects have been left as the names in code as I'm not entirely sure what all of them are. In addition I'm not sure what atropineHigh does. Anyway the list of molecules you can apply to weapons: water, starch, xylitol, sucrose, psilocybin, amphetamine, methamphetamine, mycotoxin, ethanol, cyanide, penicillin, testosterone, xanax, mescaline, asprin, shikimicAcid, phosgene, tetrodotoxin, fingolimod, thc, nodularin, hist, pal2, theobromine, retinol, glycine, alinine, serine, arginine, cocaine, cocainehcl, metblue, meoh, radchlor, caulerpenyne, latropine.
Some of that may be wrong though, I'm just taking it from the most up to date source after all and may be misreading parts, don't think I am though.