Deft attack speed does affect R normally.
Submitted by ARAMMayhem.com
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About Deft
More Katarina Combos
Slow And Steady S Locks attack speed, but R attack speed scaling is unaffected. 
Vulnerability S R procs Vulnerability. 
Ethereal Weapon S R normally applies only 25/30/35% on-hit damage. With this, it becomes 50/60/70%. 
Master of Duality A Every R tick stacks Master of Duality. If you go magic-to-physical conversion, it's godlike. 
Lightning Strikes C Lightning Strikes attack speed doesn't affect R. More Deft Combos
Katarina + Deft ARAM: Mayhem Combo Guide
This A-tier combo pairs Katarina with Deft in ARAM: Mayhem. A solid choice that works well in most games.
Deft attack speed does affect R normally.