We would also very much like to see this done soon!
We signed up for Shopify long ago without much knowledge of websites, but have grown greatly since and it now seems we have outgrown Shopify.
This slow implementation of an important and such basic URL structuring shows Shopify does not value their community’s needs!
I will reluctantly begin looking for alternatives to Shopify. I hope to hear back with an aggressive implementation date from Shopify on this so we can continue to be partners.
I am with Impulse Medical Technologies (ImpulseMed.com) and The Electrode Store (ElectrodeStore.com).