Our 737 FCOM has the following restriction in the chapter limitations:
"QFE Operation
The QFE operation is prohibited on the main aircraft altitude system due to the fact that EGPWS data are based on QNH." The supplementary procedure just contains a note that points to that limitation.
Not a problem to fly into QFE-Areas if you have a chart supplier that is up to scratch. LIDO makes a pretty good impression there, but Jepp was usable as well, only EAG was, as in all regards, really below par.