Busybox configuration

I want to have a custom busybox configuration, but I can't find all options in menuconfig.

I want to set CONFIG_USE_BB_CRYPT_SHA to yes. How can I achieve that?

Thank you,

If for passwords, I believe that it isn't possible due to the C library used by OpenWRT. I recall looking at that some time ago and the behavior was "broken" at the time in that the passwords ended up silently using crypt if a more secure algorithm than MD5 was used. I believe it has It may have since been patched to prevent the surprising result.