Since version 2.x, it appears that player Metabolism values prior to entering Vanish mode are no longer saved.  Metabolism resumes from max values when leaving Vanish mode.  Can this functionality be re-added or was it removed for some reason I am not aware of?

Re-adding the dictionary and associated code to the plugin seems to work fine on the current release:

private class MetabolismValues
{
     public float health;
     public float hydration;
     public float calories;
}

private Dictionary<ulong, MetabolismValues> _storedMetabolism = new Dictionary<ulong, MetabolismValues>();​

It was removed because so many people complained about "losing health"

That's an odd way to put it.  I would say now it's like a free health boost if I double tab my vanish bind. Maybe consider adding it back with the config setting as well, but default it to "false" if this is what most people want. 

It would be cool if that were in the config. We need that on our server.

Honestly yes, we need that back too, even if its behind a setting (that defaults to off).

Just adding to the list, would prefer this be a config. Otherwise it is basically a cheat.