I thought I would share a simple workaround for the healers/casters out of mana issue and to offer it as a suggestion for this addon, though I'm not sure it would work since it relies on bot names.
Anyway... Since there is no way to tell a healer to sit and drink mana (at least that I have found), I just created a simple macro to refill the mana using GM commands. This is what I am using to give a reasonable "Retail" experience.
MACRO:
/use *drink*
/tar *healer bot name*
.modify mana *total mana*
* = change to match your circumstance
I'm open to any suggestions... there may be a more sophisticated way of doing this, but it has been working fairly well for me. When I sit and drink, the bot gets a full mana pool also. Maybe this will help someone that's not just looking to cheese through it all.