Shortly, I plan to test a game based on Fate 2e (the self-contained rules set, available here) and the Shadowrun campaign setting, with slight modifications. There have been a few things troubling me about this. The first one is items, partially answered in the recent question, and the second one is invoking for effect.
A big part of Shadowrun is planning and money. So you have to think through the operation, and decide whether you will spend the money to buy a rocket launcher, for example, which you might need later.
However, a normal fate player could probably just get himself into a sticky situation and then say "i invoke my aspect preppy pyromaniac, so I have bought a rocket launcher earlier". I find this disturbing to what I imagine to be the classic shadowrun playstyle.
Am I wrong?
What's the generally accepted limit in this type of invocation usage?
Is there a problem in banning this type of usage? I know it will be less story driven, but can I still call it fate?
Is my concept even viable without losing the good point of both games?