Not currently, no. Default values are only used at the product key creation time. If you want to edit multiple values at once either use the web API or use the LimeLM interface and select all the keys you want to edit.
custom license field question
xlrotorIf a custom license field is changed at the product level, is it possible to have this propagate to all product keys created for that product?
Background: I have a product I want to expire annually at the same time for all users, and this date will be updated every summer in a custom license field, applicable to all users. For users which no longer get to use the product, their product key will be revoked.