I was watching that thread as well....
It will take more than your ambi safety snagging on something to cause that hammer to fall. Nonetheless, the mere fact that you're concerned may be suggesting you that a different firearm would be a better choice for you?
I still keep a full-size 1911, but swapped my Kimber Ultra on a Sig P220 carry elite. It's a bit longer and heavier, but it's a DA and isn't plagued by the spring issues I was having with the Ultra. While I was never uncomfortable safety-wise carrying the Kimber, I don't even think twice about the safety when I'm carrying the Sig.