Adding column to npc_types

[Disorder]

Greetings!

I've been messing around with npc_types editing the entire DB at a time, just so see how it works out. I made a few changes..

HP = HP / 8
maxdmg = maxdmg / 8
mindmg = mindmg / 8

Doing this affected pets. After going through and comparing spells to npcs that are spawned, I realize that to change all pets in a similar manner is not a quick task. Would it be possible to add a column to the npc_types called "ispet", 0 being default of non pet mobs, and 1 being pet types. This would allow for easier changes to pets I think, using a WHERE argument in db changes. I was thinking about trying this with my own table and going through manually and updating the pet npcs. Would this stop my DB from functioning correctly?

I know some of the words I used loosely relate to their actual definitions. I'm still ignorant of all the correct language to use when describing such items. Regardless, I think most of you should understand what I am saying. Thanks, guys.