I have mixed feelings; on the one hand it should be not too difficult to add such an option; on the other hand friendly fire is a fundamental part of the game (as it was with nwn and bg). I personally would not use such an option (unless it turns out i was totally stuck without such an option which i suppose might be possible since I am totally inept) but conversely does it hurt to add it to those who absolutely demand to play in such a fashion ?
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One could argue that it does hurt since it dilutes the developer vision but to be honest such a thing is really up to the developer so I think perhaps we should leave it at those who want such a feature to request it and the developers can then consider it. I see no real value in arguing against such an option since (a) it probably does not take too much effort and therefore hurt development of other aspects of the game and (b) it is the developer decision and hopefully they will comment one way or the other (c) and the developers could label the option to make it clear that this is not how the game was intended to be played so those others who wish to play it the 'intended' way know not to use the option which hopefully removes their objection to the option smile

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One aspect I can see (from the request) is that if people cannot have a good time playing with friendly fire is perhaps try to understand what aspects of the tactics are too difficult for people to grasp.
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For the record I see no need for the option but I am trying to remember if nwn or bg 2 had such an option; I think maybe one of them did - maybe it was nwn ?