How comes that this feature is neither mentioned in the NEWS file nor in the documentation?
It was presented by Han at EuroBachoTeX 2007: `Font-specific issues in pdfTeX'
(I don't know whether slides exist on-line, via google I only found a non-existing pdf file, but at least google's html view was available.)
Hmm. This isn't a replacement for documentation. IMHO, it *must* be mentioned in the NEWS file (perhaps in the `experimental' section'.
I think there are unsolved issues. Now there are two methods for adding CMaps: (a) \pdffontattr, package cmap
I use this in my CJK package too.
(b) \pdfgentounicode, glyphtounicode.tex
Both methods have its limitations, e.g. (b) only works for Type 1 fonts. Thus you could need both methods to cover all fonts, but the methods doesn't know each other, thus fonts can end up with two CMap tables.
Indeed, those features should be merged. Werner