.onedriveignore, an ignore file like git
gitignore for OneDrive
Add a .onedriveignore file to the OneDrive folder (global) in which you can specify files/folder to ignore.
Do the same for subfolders.
This would allow easy syncing of Visual Studio projects for example, as currently the application just syncs non stop if you open a solution file that has it's data stored with OneDrive.