The concept of this plugin is great, but there are a few small bugs coming up before I even get far.
I'm only using this plugin on my localhost to start with.
Product Description Formatting/Escaping
When saving it is escaping line breaks with "\r\n" and then if you don't remove them it continues escaping them.
I added a new Specification field
but when printed it came out as "Price 4"
So I tried the following
and it printed as "Price 400"
So it appears the "$" sign is causing issues.
I have not had time to investigate your code to see if I can help.
Looking forward to updates for this handy plugin.