Both my SP-101's are DAO (double action only) and can not be cocked. As such they came from factory with bobbed hammers. So they are snag free.
If you want to bob your hammer, I would have it done by a gunsmith, or be very careful if doing it yourself. If you take off too much steel and make the hammer too light, you can end up with problems igniting the primers of your bullets.
Also if you bob the hammer on a gun which has not been modified to be DAO, you can still have the hammer locked back in the "cocked" position for single action shooting, however it is very dangerous to attempt "cocking" the gun with your thumb on a bobbed hammer. With the bobbed hammer, it is very, very easy to have your thumb slip off the hammer, thus causing a negligent discharge. That hammer spur is there for a reason.
Now my Ruger Speed Six has a traditional hammer, but It is too big to pocket carry so I won't have the snag problem trying to draw from a pocket.
For those who have a hammer spur on their snub nose revolvers and you want to pocket carry and not have the gun snag on the draw there is a method for the draw as follows.
When grasping the butt of the gun inside the pocket, do not get a full and complete firing grip on the gun. A) you hand will be made into a fist while gripping the gun making it harder to draw the gun from the pocket. B) the hammer spur is still exposed and can snag on the edge of the pocket.
Instead, use the following method for your draw: A) Use only your middle, ring and pinkey fingers to curl them around the front of the grip, with the grip in the palm of your hand. B) Keep your index finger straight along the frame of the gun. C) Place your thumb on top of the hammer, covering the hammer spur and creating a sort of ramp/shroud as you draw your gun, thus preventing any snag from the hammer spur. Also, this kind of grip on the gun will create a narrower profile and allow the gun to slide out easier, rather than getting a full grip on the gun.
(You can get a visual effect of the difference in profile if you make a closed fist with your hand and hold it out in front of you, and look to see how big it is. Then, change from a fist to how you held your hand as a kid to simulate pointing a gun at someone, with your index finger pointing out straight and your thumb up in the air. You can see the imaginary gun is a much thinner profile than a balled up fist)
It's easier to demonstrate then explain it in text so if you need further clarification, just ask.