NOTE: I made this on a game that includes the altered sprites from the Miranda Class (In the thread called 'Help with Importing ships'), I am not sure if it works without those altered sprite files.

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Open the Vessel odf of your choice (preferably including all of the ranks, maybe avatar and mixed-tech varients) (C:\Program Files\Activision\Star Trek Armada II Fleet Operations 3.0\Data\Sprites) and add anywhere in the file:

weaponX = "XX"
weaponhardpointsX = "root"

X is the number one higher than the highest when it was added (altered to compensate for rank gained weapons and the veteran rank-up)

XX is the race specific Auto Destruct:

dom_destruct
fed_destruct
kli_destruct
rom_destruct