Non-latin symbols in fonts

I’m trying version 3 and I’m really liking it! I’d like to switch there from version 2, but there is a problem that stops me from doing it – fonts.

Then document only using latin symbols everything is great, but then there is cyrillic symbols they fallback to different font and it looks a lot worse. Especially in combination with latin letters – this two fonts have different letter sizes and boldness and didn’t work together very well:

Is there away to change default font or at least switch it to always using fallback font, even for latin letters?

I expect to address this once I begin working on themes (which hasn’t started yet, but I expect to finish before the final 3.0).