Concerning magic items and quickness

[cjx]

I'm sure this has been addressed, but my search-fu is apparently weak. However I know some of you veterans are likely to know the answers offhand:
Quickness blessing (Edit: Water9 Bless is what I am referring to of course), this gives the unit two actions plus 50% battlefield mobility bonus right? Two actions being spellcasts and/or attacks?

Magic items that list having more than one attack, will they be doubled again by quickness?

Magic items that can cast spells, do these happen automatically (rather than spending an action of the commander) and if so do they expend fatigue to do so? In that vein does the Magic Trident cost fatigue each time it attacks?

Thanks in advance,
cjx