-g or --gpu-threads now support comma separated values, yaaay!
It is exactly what it says, now you can finally put that Frankenrig configuration in one file.
The parameter follows the same design as gpu-engine and gpu-memclock.
core: Warn if GPU_MAX_ALLOC_PERCENT or GPU_USE_SYNC_OBJECTS is not set

...through export (Linux) or setx (Windows).