Merging Quadra Magic into Dualcast should be fine, but I'm not so sure about Added Cut into Double Attack, as it's not really a double attack. I'd say merge this page, but leave Added Cut alone for the time being.
But it's not called Dualcast... Dualcast lets you cast different spells in one turn, Quadra Magic lets you cast one spell four times, but with half the normal effect of the spell. Dualcast is a command ability, Quadra Magic is a support ability. And FFVII already has a "true" Dualcast ability anyway, listed on the Dualcast page.
Henryacores - "É que esta noite vou lançar ao mar/A bruma que houver em mim./Vou beber e cantar este luar/vou dançar até ao fim." TALK - Henryacores^ 18:19, June 11, 2011 (UTC)
And Added Cut has nothing to do with Double Attack. Added Cut is not a double hit: it's the use of the attached skill after an attack, which is not necessarily physical. Added Cut can be used to mimic Mug, any Spellblade attack, or even that TA2 Seer attack, Magick Frenzy.
Double Attack and Barrage have more similarities than Added Cut to anything else.
What's up with you merging everything. ;) If they are not the same ability, then why should they be merged. Barrage is associated with guns and bows; I would say the "true" version of it is attack four times with reduced attack power (so same as Quadra Magic in a way...), but it seems the Barrage page incorporates also Yuna's Trigger Happy and Irvine's Shot...which don't really fit in my opinion, but wa-hey.