Add Haste Gear and you don't have a rage gen problem. I use Deaths Bite on live (Yes, I'm Arms, and I still pull 2500-3400 on most Naxx 25 bosses, I still hate Grobby) and my swing speed is down around 2.9 seconds and under 2 with Heroism. Melee will still be 20% or more of your DPS but you won't have to worry that Slam will starve you for rage.

An Add-On that I find incredibly useful is Power Auras, it tells me when Sudden Death is up, Overpower is active, when I need to rebuff Battle Shout, when Rend drops off, basically anything I need to keep track of. Not to say that it's a required add-on, it just makes things a lot easier when you have to watch for void zones, lava waves, poison clouds, adds, and anything else that can kill/maim you.

As for your spec, it does need improvement. Heroic Strike isn't even on my action bar anymore, I never use it, I have too many other buttons to push to worry about something that happens on next swing, move the points to Parry for those times when you irritate Patchy a little too much (I actually parried 2 Hatefuls in a row when our 2nd OT went down, which was enough to get me out of range). Lastly, Imp Cleave and Unbridled Wrath can/should be dropped for things that will increase your DPS. moving those points over to Commanding Presence and Booming Voice, with the last point put into Endless Rage, since you seem to be worried about Rage Generation.

My proposed spec for 3.1 is http://ptr.wowhead.com/?talent=LcrhbfIt00bRdGuioGx00xb , and other than your choice of weapon, is pretty close to what you should be using for Arms DPS.