Alternative text fonts for the PDF version

[wdscxsj]

Hello,

The idea of a PDF version for offline reading is great, but the choice of text fonts, judging from the sample file, could be better. For example, the main text font, Liberation Sans, looks fat and crowded, and it doesn't help to read through the 1300+ pages. It's the blocking reason for me to buy the bundle.

I'd like to recommended these popular free fonts as alternatives:

• Sans-Serif (for main text and titles): Roboto, Source Sans Pro, PT Sans.
• Serif (very few places): Linux Libertine, Source Serif Pro, PT Serif.
• Monospace (for code): Fira Mono, Inconsolata, Ubuntu Mono.

Since the ebook generation is automated and the result can be cached, it'll be even better if the user can mix and match the fonts to create his own version.