I use svg-grapics in Storyline. I create them in Coreldraw, import them into PowerPoint and then import the PowerPoint slides into SL. This works perfect (although it would be much easier if I could import SVG into SL, but this is about another feature).
It would be great if the imported 'SVG' images can be a part of the Media Library (including the formatting). In the same way it would be great to have the possibility to add a shape (including the formatting) to the Media Library.