darrenhfx wrote:FWIW I thought the abovementioned tweaks in Haze/Penitence worked quite nicely. But then again I'm in favour of a thirst/hunger/fatigue system

I'm going to say this as nicely as I can. I played (and admin'ed) in another gameworld that had many of these systems implemented. One of the more vocal players called it "decent into code hell" as these systems were being implemented. I came to agree with him eventually, and started protesting the changes also, and then I left when I saw that it was fruitless. That gameworld ultimately failed as people, like me, fled the circumstances created by too much coding, among other reasons.
Now, Haze and Penitence are dead worlds too, just like the one I used to play in. Is it possible that the sum total of all these coded systems contributed to that death? Something to consider. At the point where you are spending half of your online time not rp'ing interactively, but rather running IC errands imposed on you by the game system, well, that's not exactly an rp based world anymore, it's just a series of chores and errands, and many people will find it so tiresome that they'll look elsewhere for their online rp'ing fun.
As has been mentioned before, NWN is an imperfect implementation of PnP D&D. Some will argue it is better (anonymity allows for more immersion, e.g. a 6' tall hairy marine can play a hin princess if he wants to without anybody being the wiser, combat is largely automated and resolves quickly, etc.), but there is no doubt that it is a *different* implementation of D&D rules than PnP. What that means is that every PnP rule doesn't necessarily have the desired effect in NWN. Different speeds for our toons is just an in-game hassle that means frequent jogging or slowing down, something that simply doesn't happen in PnP as movement is totally abstracted ("we go to the castle"), not actually acted out step by step as it is in NWN.
Slowing down small folks, without allowing them to otherwise evade pursuing monsters due to their small size, will be an imbalanced rule. Should they move slower? I suppose, but they should get to do a lot of other things too, that you aren't giving them with this rule.
(more later)