I like this new feature very much - great way to gain the catalysts and spell fragments + I love this little library. But as was already mentioned, the amounts of medals for each production need to be changed. Yes, it is simple to complete the task by lot of little workshops and toolboxes,I personally really dont mind to gain something for free. But if I had just small city it would bothered me a lot. It would be fine if the amount of medals would be at least for initial capitols lower.
One more comment from my side, I love this as long as it does not have an influence on tournaments. If this is just new feature for breaks without events and FA, great, you did (almost without the little problems already mentioned in comments) wonderful job. If it would have an influence on tournaments, then just keep it somewhere safe hidden.