Anybody annealing straight wall pistol brass to prevent cracking?

No

No, not worth the time and energy

I don't. I have about 2000 rounds of .357 brass that I mostly shoot 38 SP loads. Probably reloaded it at least 5 times, more likely 8. If I pickup once fired range brass, I throw it in the same can. It pretty much evens our replacing the few that do split.

I found nickle plated brass will tend to crack faster than regular brass

I'll lose it before it cracks or wears out

I have annealed magnum revolver brass in the past, probably won't again though.

After four loadings.

thought about doing just the very lip on revolver cases where one repeatedly roll crimps but never have . but have done such on 45-70 brass .

No and have never heard of anyone doing it, seems like a real waste of time and energy.

I have 38 Special Brass that has been loaded a lot. I just keep an eye out while processing and loading, and pitch any bad brass in the brass bucket. I also pitch any S&B Brass I come across. I normally discover them when trying to prime the case.
Expensive or hard to replace brass would be the only consideration I would have thinking about annealing the cases.

Bob R

Using neck sizer to match cartridges to each of my 6 Marlins.

Excessive? Maybe.