I've created a small mod that aims to fix some of the problems I noted earlier in rules.skrit
http://garage.gaspowered.com/?q=node/2011
The mod is hosted at Herena Forge: Here
edit: At this time, you'll have to register at Herena Forge to download anything.
Fixed by my patch:
* Offhand weapon is now averaged into swing damage only with mainhand weapon, not with the sum of mainhand, strength, and magic bonuses.
* Custom elemental damage is now applied from all items (added custom_effect fields).
* The double application of some custom elemental damage sources during checking for target resistances was changed. The code now subtracts the resisted amount instead of adding the amount not resisted. I couldn't properly fix this because the hardcoded function this relies on is broken.
* Edit(forgot one): Fixed Ranged dodge. See Ranged Dodge Broken