when you use dimensional dervish and if you are more than 30 feets from your opponent, does your first attack counts as a charge (as if you are using dimensional assault)?
Dimensional Dervish also happens to allow you to move between the attacks of your full attack action, moving at least 5ft each time, and because you are teleporting you don't provoke for moving.
But these aren't particularly important to your original question.
Well, I would probably allow you to use your movement to perform a charge. But you would only get one attack, as a charge is still a full round action.
So you would get virtually no benefit from Dimensional Dervish.