#1
I know its a percussive strum, is he up stroking the chord as he percussive strums it to actually play the chords?
http://www.youtube.com/watch?v=XGimWPPKpYs
ESP LTD EC-1000 vintage black
sunburst fender MIM tele
Epiphone LP standard ebony
Mesa/boogie dual rectifier
Mesa/Boogie .50 caliber plus head
Marshall JCM900 Hi-gain MII 2500
Fender Hot rod Deluxe
#2
yes, that and he gets chord progression, and using riffs for fills.
Gear

Standard Epiphone LP W/Dimarzio Super 2's
1973 Ampeg VT-22

Fulltone Clyde
Ernie Ball VP Jr
Boss tu-2
Boss sd-1
Ehx Little Big Muff
Fulltone Ultimate Octave
Boss eq-7
Ehx Memory Man
Digitech Delay X-series
Ehx Holy Grail
#3
There's more happening there than the video shows. In the first part, you have the strumming, but you also have picked notes - they're either done with a pick or fingerstyle. I don't see him playing that part. He's just doing more of a percussive strum.