I got the same issue, and same request.
Latest version of insync i use create duplication, and in some case delete file. So very dangerous when using with lot of collaborator.
We are arroud 120 users working in the Google TeamDrive, with arround 30 000 files (was 20 000 until InSync create 10 000 duplicated file).
So until the option to only sync in 1 direction (from Google to Local), it’s a huge security issue for us.
Not seem to be a priority now for inSynch (in their timeline… but no date provided).
Also, because most colaborator are not aware of long-file-name, they create structure in the Google Drive that move the lenght beyond 256 char limitation in Windows. And we have multiple NAS/SAN system that not necessary support 256 char and more, so using tools to rename folder are not consider… hard to rename when inSynch can’t copy the structure to the server…