In comparison to the regular skeleton and the Wither Skeleton, the Skeleton Warrior walks slowly when using its melee AI. Maybe you can make it sprint like a Wither Skeleton does when using a sword?

As well as this, its transition from ranged to melee isn't the smoothest, as when you activate its melee AI, it still strafes around like the new ranged AI for a few seconds before finally transitioning into a complete melee AI.

Hey, good to see you are still around :)

Will work on this.

Should be fixed for 1.1.5c-beta which is being processed for upload.