It would be nice, maybe someone has done this, but to put these redirects into say three classifications.
ReDirect: A regular natural crotch type redirect.
Remotely Releasable ReDirect: This would be an example, removable pins etc.
Self Releasing ReDirect: Retrieval ball etc.
Releasable ReDirect: One that can be released directly by the climber, On Bight for example.
IMO, there are pros and cons to all of them and all are great to have in your tool box.
I do like this and I don't want to be the guy that comes up with negatives, perhaps just a word of caution with any Remotely Releasable ReDirects. Make sure you stay clear or the retrieval end. If for example it caught your harness, leg etc and temporarily became the load bearing side of that line, the consequences are obvious. I know how some of you guys swing and fly thru the tree!