"I had to stop at the magic number 69.."
^So you are a Scorpio
Anyway I am glad you made my lz_scan (almost)obsolete because this is way better. I will later check in more detail how to do a multi-lib scan. From the pictures it seems you create a version directory and put a dll there, like 2.8.1/codec.dll, 2.8.2/codec.dll and so on, while dlls are all of same name.
As opposite to my lz_scan where I had a single directory with like liblz4_112.dll, liblz4_120.dll etc.
Advanced config is what I love about this new version and will use, really kudos for that.
I recommend if you want to call it a day, don't add a new features anymore but hang around to collect and fix last remaining bugs that users report over time. What you achieved here is a project that gives any institutional budget projects run for their money. I say lets not leave it half backed, after all you do remember Freearc(and srep) fiasco. Both a buggy, half assed projects, but no proper alternative unfortunately(at least for my usage as a GUI archiver).
After some time once project is bug-hardened with no more changes, maybe I try to port it one day to C and/or multiplatform if I decide to switch to Linux in the future. Thank you for all you did for us so far.