Simon,
It seems that two options are open to you, each with their own difficulties attached but it is the purpose of the Board that should eventually define your decisions.
I use the term 'average JW' below a number of times and as you think of the use of this term imagine it being applied to the normal JW sitting in the centre of the hall many finding the Internet, perhaps for the first time. Not those disfellowshipped, or disgruntled, or perhaps like most here, of a questioning frame of mind.
The attempt at controlling the use of the Internet by the WTS has without doubt failed. You can prove this Simon by noting the repeat IPS addresses of vistors to this site who do not post, or have not subscribed.
1) If your desire is NOT to attract the 'average' JW to visit and post to this Board without reeling, then the the present model of self-moderation seems to work as well as can be expected given the diverse personalities. If this is the model that sits comfortably in your own mind then perhaps the controversial header, 'Discussion Forum For Jw's etc'. should be dropped as it is misleading.
2) If your desire is to attract the 'average' JW to visit and post to this Board and learn in a more gentle manner the theological options open to them, then a firmer and more autocratic moderation might be needed.
Either way, its your Board and your responsibility to make these choices. I echo the sentiments of many others in thanking you for providing a voice to the many previously silenced ones.
My very best to you -- HS