I experiment the same comportment (on latetst 8.8.2 extension with both FF30 and FF31), for example with the following
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SET !USERAGENT "Hello World"
"Hello World" will be my useragent until I close my browser. But, next time I open it, my true user agent is back.
For me it's not a issue, as I am playing many iim file in some js (and js close the browser at the end), I need to set my user agent only one time and not in each iim file.
I think anybody who launch iim with some scripts will prefer to set the user agent one time at the beginning.
I agree with chivracq, if you need to get back to your true user agent, just set it at the end of your iim.