Fair enough, thanks for sharing your insights Hellebore.
While I have your ear, could you elaborate on your experiences with dual-weapon fighting? More to the point, why multiply the damage? It seems to me that adding DB then multiplying makes any kind of fighting other than dual-wielding weapons with DB 2 or 3 pointless.
The catch is that you must subtract the combined DB of the weapons from your CS. That will reduce the amount of damage that you do. You only double the combat results table number.
So you could be CS 24 and dual wield 2 axes. You do 6 extra damage (3 from each axe), but are only attacking at CS 18 (-6 to your CS). If you do 3 damage to the target on the combat results table it is doubled to 6. Total damage dealt is 12.
Basically this does two things: it encourages 'rogue' like dual wielding as the less damage done by the weapon the less your CS is penalised (so dual wielding daggers is easier than dual wielding axes) and it allows people who don't have dual wielding disciplines to dual wield, albiet not as well as someone with that ability. It was more for flavour to give a way to dual wield that didn't require you be a buccaneer of Shadaki etc, whilst not necessarily being superior to disciple dual wielding.
The Buccaneer's Blood Tempest just lets them make two attack rolls. So if they were carrying two axes they could make two +3 damage attacks with no penalties, or dual wield and suffer -6 to their attack roll.
If you compare it to the above, my 'untrained' dual wielding is basically identical to blood tempest except you suffer a bigger CS penalty the larger and nastier the weapons you use. This IMO makes sense, two daggers are easier to manage than two axes or warhammers.