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If you just want to use a different pose you simply change the animation range.
Look in the uber soldiers fpe and where it says anim0 = anim1 =, etc. That is anotated with a description, just change the numbers after the one you want to change. Also in the folder with the uber soldier is a text file that lists all the default animations and their frames.
If you want to change it so when theyre not fighting they don't hold their gun up, then hold it up when in combat, then you would have to write your own combat core. the default AI script doesn't have that feature.
What you need to remember is that the AI scripts are simple basic examples of AI scripts, if you want something more advanced you need to script it yourself.
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