@silentspace: Withdraw is a full-round action... you can only move+attack, but will provoke AoO then... Tumble or 5-ft. step are about the only ways to prevent this.
I liked the idea. I was just hoping I could flank somehow/someway (and get extra dmg and a better chance to hit). Plus I love tumbling. It is a skill I try to have all my characters (no matter what class) take if they aren't going to be carry a medium or heavy load (or wearing medium or heavy armor).