Use Flicker as main, and dual strike for one monster...Possible?

[Zoloft 0]

I have flicker strike as my main attack, it works well,, unless he runs into 1 rare or unique monster with no other monsters around.. casts blood rage but never gets any charges because he dosent kill the monster, result = stands there and use's flcker every 3-4sec and dies. is there a way i can use flicker for mobs, but use dual strike for only 1 mabey 2 monsters??

[FiftyFiveMonk 0]

In the skills setup, tell it to only use flicker when there are 3+ monsters within 300 units. Have Dual Strike to be used on "special" mobs.