[Suggestion] GUEST_MODE nodes blacklist

[iiiCpu]

Hey!

How about this evil feature:

1. Read list of nodes from GUEST_MODE
2. Inject your function into the beginning of execution for each node.
3. If one of the nodes from the list is about to be executed, throw "Ur Mama Joke" exception.
4. ...
5. PROFIT!!!

Ok, maybe "Ur Mama Joke" is too much. Maybe. But the rest sounds rather simple to implement. It would be even better if it were possible to hide them from being listed in API. But i'm realistic on this sort of features. Pull bigger weights after you can take a smaller one. And digging into REST API does not sound small by any mean.