I've got an excel sheet with all the herbs and poisons from every RM supplement published with the exception of some M**P modules. I have Hands of the Healer but have not gone through it to harvest all those herbs because I know such a work would be unpublishable. It's been an ongoing project for me for a while now in an effort to create a supplement for using herbs that was friendly and easy pick up for on the fly uses.
For instance, while the Excel sheet is useful if you have it at the gaming table, many people prefer hardcopies so I've been creating a series of tables for each climate, or locale, etc. I've also been working on a series of more detailed rules for foraging and finding herbs, and for using herb lore for remembering details of herbs for certain regions, as well as more detailed rules for herb usage and preparation into various forms (tinctures, poultices, etc).
Finally, I've started musings on new spell lists for Herbs. I'm envisioning a replacement for the Animist list, as well as a Closed list for each realm that differ slightly, as well as a Poison list.
But for now, back to the Shadow World Player Guide!