A seperate tool is being made that allows easy ways for store owners to edit metafields via Custom Fields. Check the Project Homepage for info.
Already using this tool? Leave a tip to support the development! Those energy drinks aren't cheap - keep me caffeinated so I can keep working on the tool.
Only the minified version of the script is loaded and I'll make that file as required. Any pull requests should be made to the unminified verison, complete with nice verbose comments for other devs.
Many kind people have given pointers, help or a good old fashioned prod to keep me going. Some of these are (in no particular order):