Thanks. Regarding the Queue documentation I think it lacks some details (e.g., the run-once option is not even mentioned there nor in the documentation of Run). And yes, I believe an end-to-end how-to guide will help a lot - for queues and for all other features 
The description you gave regarding --proto is very clear and I believe I understand it completely now. In my personal opinion, I don’t think that adding the --force-sourcecode is a good design choice. I think it makes the usage of this feature ambiguous (with respect to its purpose), more complicated, and dangerous (you could easily pass flags that are no longer relevant, or ignore flags that are important to pass with the new code). I completely understand why it could save time though, just think being explicit and clear is more important in this case (especially when you have the configuration files that already save you a lot of time).