I just installed pod-mode.el to have starting point for modifications.

Well it works somehow, but renders all formatting-codes the same way. Tried to change them all to "bold" face but this doesn't work ... seems as if the faces must start with "font-lock-...".

Example

'  (append pod-font-lock-keywords-2
          (
        ("[IBCFXZS]<\\([^>]*\\)>" 1 font-lock-warning-face)
        ("L<\\(\\([^|>]*\\)|\\)\\([^>]+\\)>"
         (2 font-lock-reference-face)
         (3 font-lock-function-name-face))
        ("L<\\([^|>]+\\)>" 1 font-lock-function-name-face)
        ("E<\\([^>]*\\)>" 1 font-lock-function-name-face)
        ("\"\\([^\"]+\\)\"" 0 font-lock-string-face)
        ))
[download]

In this example I changed to font-lock-warning-face, which works. I couldn't find out how to define new Font-lock faces, maybe somebody here knows... PS: This is far beyond customization, experimenting with elisp takes hours and days...

UPDATE: OK, solved the problem, "FACESPEC is a Lisp variable (a symbol) whose value is a face name." I just needed to define a variable!