Organs have few pain receptors in them, so adding any there is bogus. Pain receptors should be concentrated around the skin and bones, but not at a level where dwarves faint from broken toes.
While not completely accurate, I prefer to think that the psychological effects of having a major organ damaged would contribute more to the effects we see in DF.
I usually only increase the kidney, spleen and eye receptors a significant degree.
Lowering pain receptors in bones to 5-10 is a bit low though. I use 13 and 2 good breaks usually will cause fainting. Acceptable as far as my needs go.
Are you sure? I used 35 to 40 on the bones and they seemed to do that in arena.
2 chips would be the lower limit I saw (which is likely average), which Ive always imagined as more painful than breaks.
My experience is that broken bones tend to stack up quite quickly.
I use 10 most of the time, and agree that 5 is on the low side. The organ changes balance it out to an extent, and the feel I get from it seems almost like an adrenaline simulation.
Combatants will fight on with several broken bones, but will take the pain penalties and often pass-out awhile after the bones are broken.
I prefer this greatly to things passing out immediately upon the bone being broken.