Hi ander111,
ad1) you can also incluce fonts to epubs with calibre
ad2) with the "russified" fw you also get a hacked (pepak) Adobe-Viewer so you can setup default userStyle.css with some fonts copied to the IM of your reader. Works only with EPUB.
For RTF/Txt the systemfonts are used. These got replaced by the hack to.
See availiable glyphs
here
To your PS: Links become underlined after posting, but arn't in Preview. No need to underline manually.
HTH
Mark