yes, they both count equally to your bonusses. Although im not sure as to wether it gets counted as BFE for lowland war bonusses.
Go to the mage and swipe from right to left. On iOS, anywhere is fine. On droid, must be on the textbox about elements (for most versions).
Does equipping more than one piece of the scrag EQ make any difference to the rate you clear the special bars? Eg mesmeric ring and bloodless helm on bar in TS
No, it's enough with one of the equipment pieces. Having more than one won't increase the damage you do on the bars.