Just now, I needed to exempt a couple of subtrees from TODO dependency blocking. I found that you can do this by setting a subtree property NOBLOCKING.
This option appears to be undocumented (by which I mean, it isn't mentioned in the manual's dependency checking page, and a web search for "orgmode todo noblocking" turned up pages about TODOs but none with any obvious reference to noblocking). I found the property by grepping the .el sources for "blocked" to find the org-todo function, and then scanning the function until I found something that looked like property access. Was it intentional to omit this from the documentation? hjh
