You switched from “bummel”(bmml) to “bumper”(bmpr) which sounds better and is in fact much faster.
One advantage of the file solution was that you could easily open all your mockups and run a search&replace command in a text editor to change for example names in every mockup.
It would be great if you could offer something similar in the new version.
In a current project I need to check about 100 wireframes and change every occurance of the name. For text I couldnt figure out how to use symbols wise.