On this DEV WIKI page http://dev.virtuemart.net/projects/virtuemart/wiki/Product_custom_fields_without_stock_control
WE can see picture - e.f. third from top, which have RED TEXT, which explains edit fields of dialog to create Custom Field.
Why this is not made as tooltips in this window ?
I think this will be helpful a lots.
ALSO,
watching more on this picture
http://dev.virtuemart.net/attachments/327/Virtuemart-2---Administration-customfields-EDIT.png
it is clear that we have here TWO sets of fields:
1) for frontend
2) for back-end
I'd make visual two groups for these sets of fields. Agree?