Masking passphrase entry has been considered a not-so-great addition to actual password/passphrase security. Also, some (USB) tokens support/require alphanumeric passphrases instead of a numeric PIN.
OSX PIN input requires numbers. Instead of this restriction it would be better to add a "show PIN" button to reveal the input field while pressed, so that possible errors could be noticed.
Masking passphrase entry has been considered a not-so-great addition to actual password/passphrase security. Also, some (USB) tokens support/require alphanumeric passphrases instead of a numeric PIN.
OSX PIN input requires numbers. Instead of this restriction it would be better to add a "show PIN" button to reveal the input field while pressed, so that possible errors could be noticed.