That's a slipery slope there. Dictating what the players may or may not attempt. I can see why you want to do it but I've had both sides of the coin there. Some players will push the envelope of what the GM will allow just to find the boundaries, whilst others will be adamant that that's what their character will do because that's what they want him to do. The latter can end in tears and/or you can loose players to railroading.
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