Although I haven't read through this entire post, I would like to point out something...
Spoiler Alert:
In Dungeon Issue #119 on page 44 there is an NPC
She is a Female Drow Swashbuckler 3/Fighter 4/Dervish 5
Amazing creature, and really did a number on my PC's. I will list her feats and skills.
Skills: Balance +19, Bluff +7, Climb +11, Diplomacy +3, Intimidate +3, Jump +22, Listen +11, Perform (Dance) +16, Sense Motive +5, Spot +1, Tumble +21
Feats: Combat Expertise, Dodge, Highborn Drow*, Improved Two-Weapon FIghting, Mobility, Spring Attack, Weapon Finesse, Weapon Focus (scimitar), Weapon Specialization (scimitar), Two-Weapon Fighting.
Just an FYI.
Now...
One could rule that you are not making a full attack, but using an extrodinary ability as an action I would say that you are not eligible for the WWA, since you are not using the full attack action but using an extrodinary ability as an action. This is somewhat of a stretch.
(Page 142 & 180 in the PH)
You could also rule that in this case, if she WWA's while she Dervish Dances, then she must give up her dervish dance since this is a special ability, and in Whirlwind attack it says "When you use the Whirlwind Attack feat, you also forfeit any bonus or extra attacks granted by other feats or abilities (such as the cleave feat or the haste spell).
(PH 102)
I personally wouldn't allow it in my game,
But in the Dervish Dance description it says she takes a full attack action, so one could rule that WWA can be used in conjunction with Dervish Dance.
But in this instance I belive that Whirlwind Attack does not allow any use of special abilities given by Dervish Dance when used in toghether.