According to this http://www.rebol.com/docs/changes.html#section-1.7
--do should work again
but when I tested on Rebview 1.3.2 / Core 2.6.3 rebol.exe helloworld.exe --do "verbose: true"
with helloworld.r:
probe verbose
input
This triggers an error
** Script Error: verbose has no value ** Near: probe verbose input
So does it work again or not finally ? :)