From what I have seen, most ranges in the DFW metro area do not allow drawing from the holster by default, but some do based on certain conditions... like you take a specific class they offer which qualifies you, and/or you sign a waiver, and/or you are law enforcement.
As far as holster-less carry, I have often carried a DA revolver in a jacket pocket with no holster, but never carried IWB without a holster. If I was inclined to carry my P-07 without a holster, I'd probably use one of the trigger-guard-only "holsters" with paracord tied to a belt loop just for peace-of-mind. I have good Kydex IWB holsters for it so it never really crossed my mind.