Question on editing Map Rules

[mishurd90]

So I'm currently trying to have some fun creating some custom rules in a map by editing the rules within the .mpr file 

what I'm trying to get to work is making a SAM site a ground defense weapon instead. this works well with the AA gun changing it to a 155mm works as expected, but even after trying to tell the SAM to attempt several different weapons it just wont target enemies. is this just a hard limit with the base code or am I missing something?  If it was, I would assume the AA gun would follow the same logic and it "kind of" seems that way because you can't manually target things, but it will still auto target incoming enemies...the SAM will not. any potential insight would be appreciated!

Path Beyond Mod.mpr