you probably want to look at EntityList::Bot_AICheckCloseBeneficialSpells() then. it gets called by Bot::AI_IdleCastCheck() and is passed a float for range (iRange), but it doesn't look like it's checked anywhere before the bot in question is instructed to cast a heal. i'm not sure off the top of my head if that would cause the bot to run into range and heal or not.
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