Having dug through MTUtils in order to custom my pack, I agree the docs could use upgrading.
The [10000] is a list of chances for the item outputs to be made (in hundredths of percent). Setting it to any smaller number gives a chance that output won’t happen. (i.e. 5000 for 50% failure to output)
That false part is exposing a recipe optimization flag, that if I’m understanding the RM correctly, gets set internally when the database is re-ordered for faster use. It should just be false without option for tweaked-in recipes like MTUtils creates.