Originally I had used this when farming Ikatsu for exp but with the massive damage output I feel this could be applicable to a number of uses. My "damage" is only around 9k atm and with this build I can get up to over 70,000 DPS in burst intervals. If a level 51 can put out that kind of damage I can only imagine what someone in full Inferno gear could do with this. Also, Rapid fire isn't necessary for this to work, you could really use any skill you want as the focus is on the Caltrops burst potential from being stacked.
Was doing this earlier today after hitting 50 with a good amount of success. Was a bit tricky at first but once I hit 51 and upgraded my gear it quickly become a breeze to do. If you're tired of traditional grinding this spec is amazing for blowing through Ikatsu solo very quickly if you have a friend who can give you the waypoint.
Generally I run to a corner at the start, drop Mark on the floor and 3 Caltrops which are more than sufficient to hold off the little shadow beasts. Whenever Ikatsu finally spawns I'll see which way he's coming from and burn through all my discipline dropping as many Caltrops as I can. Then just sit in the corner and rail him with Rapid Fire. Between the Rapid Fire DPS and the damage from the stacked Caltrops it's generally enough to force him to go straight underground. Use Prep when necessary otherwise just wait it out and regen up your discipline through Bola while he's submerged. One he pops again as long as another stack of Caltrops are down it should burn him down almost instantly. Use SS as necessary for survival, only time I found myself popping it was if he snuck a desecration underneath me.
To maximize your damage potential I'd suggest searching the AH for a lv 60 weapon with a Requirement Reduction of 10. Searching for this I was able to get a decent bow around 500 DPS for about 100k gold. The damage output from the higher level bow is insane for stuff like this. Good luck and happy farming.