If I were you, I would use the folowing template and put the rest of your featpoints where you want:
http://joharaoc.eu/feat?link=v16_116...d5ae0d3540d73c
Because:
1- retaliation: uber when leveling
2- Burst of aggression: same as above
My advice: pull 5+ mobs, pop up retaliation and fire banner, guard of dancing steel, burst of aggression. Then switch weapon and use bloodbath.
Fill the blanks with feint and hail of furious strikes.
As soon as one of them dies, use BoA again.
As for carnage...well...I don't recommend it before lvl 70 and whirlwind. It would be like getting a burger without the meat^^
About your naga, I also have one and I didn't touch anything, I just let it on "numpad" position and changed the shortcuts ingame.
I personnaly use the side buttons for most of my combos and important spells such as bubbles, stances etc.
Don't forget that when you press Alt in game, you have access to a secondary shortcuts bar; meaning that you can use 1 button of your mouse for 2 different things
Have fun