Dan:
Here's a thought that may run counter to the grain. I'm not sure if its a wagonload of poppycock, or if it has some merit.
Biodiversity is created by multiple niches....in an old forest you have these so called "climax" species that have taken over after the "pioneers" did their thing. So, in a relatively undisturbed forest, you have no pioneers anymore? If the end goal of forest management is biodiversity, within the confines of that forest patch, perhaps climbing without friction savers and knocking off a branch or two or ten is actually good. That tree is an environment for diversity, and perhaps killing some branches, for example, will open up an opportunity for some insects and fungus that wouldn't otherwise be there....(or it may be an infection that kills the whole tree...but then dead trees harbor biodiversity)
So, which are we hoping for? Tree care or forest diversity care?
It is almost exactly counter to wise tree doctoring, so I look forward to hearing everyone's comments.