Yes, I appreciate your point that "its fine with armour". I now realise that adding the percentages would make me virtually immune to some physical attacks especially when wearing an ammy of protection - so changing the calculation of physical protection would almost certainly make high levels (and others with lots of good armour) too powerful against fighters.
As for your friend's clever comment
please note that I happen to have a mithril coat of lesser cold protection (25%), coupled with the Boots of the Cold North and Hierro's ring - both of which have a higher than normal protection. Wearing that combination means I have zero protection against some other common forms of attack like fire, as well as reduced damage &/or stats compared to my normal "battle gear". So I would only wear that combo in specific circumstances (probably only in the "cold" part of ToL in fact - and afaik those mobs inflict other damage (not just cold!!). And the next best protection I can muster is less than half the maximum vs cold.
Your suggestion that spell effects shouldn't be subject to the multiplication sounds interesting
please please would it be possible to add that to your "TODO" list
(I hope that protections are recalculated "properly" by the way otherwise any change like that could cause a problem, e.g. unapplying an item reducing a protection below zero!)
Thank you for fixing those mobs
Maybe I won't "quake in my High Boots" when they are around now (I got killed once again last night by accidentally waking of them - the fix was too late to prevent that