I'm doing some cleanup on this over Easter. Will make a new branch for it but the plan is to kill off per product custom fields which will also let me move (unless there's objections) the markers into the description of the master metafield so this:
I have got this roughly implemented already - just need to refine and test to avoid making things go boom.
The whitespace for the fields is something I can help people avoid adding in error too.
Just as a heads up, the latest edition chrome extension didn't pop up the metafields information on the General Settings page. I thought I was just going crazy until I tried the bookmarklet which worked fine...
This was a first time install so not sure if it's a new issue, or just my particular setup. (Chrome 34.0.1847.116)
This thread is talking about the Custom Fields extension - not ShopifyFD. This does not add a metafield edit box in the settings (though perhaps it should). I'll guess you're talking about the other one so I'll take a quick peek at it just in case there is some quirk. Do note that both the extension and bookmarklet use the same script source so I would have expected it to fail on both.
Thanks for the feedback - don't get much so even false alarms are handy ;)
Have you tried using the newline_to_br filter on the output?