I've found you can keybind Skinning to a macro, unfortunately I've not been able to do the same for Herbs or Mining.

Basically...
/targetlastenemy
/use Skinning(Master)

You need the (Skill Level) after Skinning, exactly as your current skill is, in your spell/ability book.
You can have any number of toons simultaneously attempt to skin a mob, although I've always just had one of each per team: Skinner, Miner, Flower Picker.

Having multiple skinners is a nice idea, if more then one can gain the resource, thanks for sharing ).