My camera is the Pentax K-50 but I imagine this will be similar for other Pentax DSLRs.
My workflow for shooting usually goes like this: first take a test shot, then view it with the "bright/dark area warning" feature to check if anything's blown out or at zero, then take a bracketed exposure if it is. Since I do this with pretty much every shot, I'm looking for a quick way to take a bracketed exposure, and then just as quickly change back to single-frame mode.
So far I've found the following two options, neither of which is really satisfactory:
I can turn "one-push bracketing" on and set the "meter operating time" to its lowest value of 3 seconds. Then pressing the shutter release once will take a single shot, whereas holding it down will take a bracketed exposure. This would be ideal, expect that if I take a second single shot within six seconds of the first one it will think I'm taking the second shot of the bracketed exposure and underexpose it. This means that if I want to quickly capture some action, I'll end up with a random selection of correctly exposed, underexposed and overexposed shots as the camera cycles through them.
I can turn "one-push bracketing" off and assign the Raw/FX button to exposure bracketing. This has the disadvantage of being rather fiddly, because I still have to navigate through the 'info' menu to turn it off again after I take the shot. If I forget to do this it'll take three exposures the next time I press the shutter release, and then I have to waste time fiddling around in the menu trying to turn it off while I miss the moment I was trying to capture. It also means I can't use the Raw/FX button for other things like DOF preview, which can't be accomplished at all unless Raw/FX is assigned to it.
Is there another way that I've missed? I suppose what I really want is a way to say "I want to bracket the next exposure", as opposed to "I want to bracket all exposures from now on." Failing that, a non-fiddly way to go back to single-shot mode would be really useful. How do other Pentax users deal with these issues?