Monster types such as undead, summoned and animal can be set with the "bodytype" value in npc_types. I can't remember the exact values for each type but it's in my parser code so I'll find it and post it here if you're interested.
Configurable resists will be in the next version (4.2) I think, it will add 5 more values to npc_types, one for each resist.
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