Attached is a patch that lets local variables define whether or not todo
dependency blocking should be used (both for TODOs and for checkboxes).
I have one file in particular that I'm using checkboxes to quickly
indicate multi-selections from a list but for most of my files I want
TODOs blocked by uncompleted checkboxes.

Normally org uses hook methods for checking for TODO blocks and this
patch just inserts a check at the top to test and see if the variable
turning on the blocking type is still set.

-- 
Wes Hardaker                                     
My Pictures:  http://capturedonearth.com/
My Thoughts:  http://pontifications.hardakers.net/