I was thinking about building something that would solve "Shared symbol libraries for teams"

It would look something like this:

• There would be an app, that lets you search for symbols
• You can "place" these symbols into sketch
• With a press of a button, those symbols would update

Would something like this solve your problems? If yes, would you be willing to pay for it as a customer? If yes, how much? :)

Here's a quick mockup of the idea: http://imgur.com/a/7acqk

I think it's more of a comfort thing. I use scss, and just asked myself why not sass because you asked :P