Thinking about the exact same thing. Both features would be absolutely great.
The first part should be fairly easy. Just having an additional field or table that maintain the module versions per user per rack.
The last bit, getting the new fw versions automatically available in modulargrid, will be quite challenging. depending on how willing any manufacturer wishes to cooperate. If modulargrid provides an api provides a simple api a manufacturer can itself choose to use it and publish the version.
I've no idea whether there is any development going on at all.