Thomas,
Completely understand what you are wanting, but from an insert perspective (input or mix), all inserts are treated as “outboard” gear regardless of what it is, thus the gang options don’t have any effect on it. This is also why a “channel copy” doesn’t copy the Dyn8 settings (unless that was changed recently).
If it happens to be a stereo bus, you get a stereo Dyn8, which is implicitly linked internally. What I think you are looking for is the ability to link Dyn8’s independent of assignment. I would take it one step further to be able to link N Dyn8’s (mono or stereo) to all behave the same for those that run in a surround or non-stereo environment.
Jay