@meem: It's as simple as ever, you're just trying to complicate things yourself, read the docs... There is *no* file to edit... (Unless you really know what you're doing, which you clearly don't, so please forget about editing files...).
@Dusty Star: No, you don't need to reinstall anything, a factory reset doesn't remove the hacks, it just clears the userstore. (And, as a sidenote, you really *don't* have to do a factory reset when your K3 barfs on some fonts, just switch them, or disable the hack [by renaming the linkfonts/auto file], and restart).
With which font set are you having issues? (I doubt I'll be able to do anything about that, given that I can't reproduce any of these issues on my device, but still, it'd be good to know

).
@Legion: No idea, but I don't *think* that the Update link is disabled on unregistered devices, so you shouldn't have any issue

.
@pashlit: You can't (easily, that is, you'd have to edit the default Caecilia family to insert a full set of Cyrillic glyph into it...). (Note that this would be way easier to do on FW 3.x, because the Cyrillic glyphs are pulled from another font entierely).