Solution defined snippets would be extremely useful too! As long as they get stored in a separate file inside the solution so they can be versioned while the solution file itself is ignored (generated locally).
That does indeed reduce the usefulness of multiple create file templates a bit, but they'd still be a good feature.
For solution-defined settings, we have a .va directory located in the directory that contains the sln file. The .va dir has user and shared sub-directories. The shared dir is intended to be in source control, while the user dir is intended to be .ignored. VA features that currently support solution-defined settings are hashtag filters, VA Step Filter and Source Links.