Code snippets and Item templates distributable trough nuget packages, just like Roslyn Code Analyzers
If we could include code snippets and item templates in nuget package, we could easily create project specific or library specific snippets or items templates.
For example, Prism.MVVM nuget could contain MVVM specific code snippets like propnotify or viewmodel. We could further increase team productivity by custom item templates, like Page with ViewModel that are valid only within the project.
You have already done something similar with Custom Code Analyzers.
It's worth mentioning, that also many Visual Studio settings, e.g. naming conventions makes sense to make project-specific, either trough nuget or another mechanizm. ReSharper may be good example how to achieve it.