Hey, fitz! You are most welcome for anything I do that you find at all helpful. I'm still a fairly new climber myself compared to most on here, probably. I may have been climbing for between two and three years, just guessing, and that is sporadic.
Everything I know was gained in just the way that you are doing it, so I owe a huge debt to all of the climbers around the world who choose to share their knowledge on the forums and in their videos. I understand what you are saying about how tough it is to find the videos you are looking for to learn how to do this stuff. On YouTube, it's tough because you're always looking at a selection of individual videos, and it can be difficult to wade through all the stuff. It's almost like trying to find a word in a dictionary that is not arranged in alphabetical order.
There is one climber that I'm not sure ever participates much in the forums, but whom I credit almost completely with the fact that I climb at all, because he came up with the solution to the problem outlined in the paragraph above. His name is Daniel Holliday, and he hosts a website that contains the single most comprehensive set of videos pertaining to climbing trees and doing arb work anywhere. Especially for those new to the entire subject. I've sung his praises before, so hopefully the members here are not rolling their eyes when I do it again.
The thing that makes Daniel so different is that I can tell he had a plan in mind before he ever started producing his videos. He set out to produce a fairly complete set of videos, going from the most basic techniques to the newest and most complex, and he succeeded. The advantage to his website is that the videos are arranged by category, which makes it easy to study one area intensively.
Here is the link to his website.
http://www.climbingarborist.com
To see a small bio of Daniel, click on the "About" tab at the top of the page.
I do not yet own the Rope Runner, so I cannot fully understand the significance of your statements regarding the spring and the bird on the Rope Runner. Having said that, failure of the top part of the Rope Runner to engage is what could cause a rapid and uncontrolled descent, I think. I think you participated in the thread on this forum about "Rope Runner Problems" or something similar. Multiple people commented on having a "weak spring", or words to that effect. Monkeylove said he put more twists on the spring to make it react better. I think you need to go back and read every post in that thread closely. A spring failure on the Rope Runner can be fatal, if I'm understanding things correctly, and I think the latest iteration of the Rope Runner made a change to the spring for just the reasons you have outlined.
Making sure that the Rope Runner engages prior to putting your full weight into it, either because it's acting as it should, or because you set it with your hand in a manual fashion, is an absolute requirement for safe use of the Rope Runner.
Also, I think Kevin Bingham himself said in a post that he uses the "bird" primarily to get the descent started, but that he uses his hand on the back side of the Rope Runner to really control his descent, if I'm remembering correctly. I think using just the "bird" to control descent makes things a bit more jerky than it has to be, according to Kevin.
Too wordy, once again. Thanks for putting up with the long post.
Tim