I'm not sure if this gets you any further on, but according to this [broken link removed], self service checkin kiosks can be used if it's Riga your departing from.
I don't have a definitive answer for you as despite the fact that I could have potentially flown with them 6 times over the past 18 months, I flew Ryanair instead. Their fares are off the charts! - from what I remember, they were usually double.