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Riding SS with only a front brake is a bad idea, your ability to stop quickly is greatly reduced and if you do try to stop suddenly whilst traveling at speed you'll more than likely end up eating shit over the handle bars and require a trip to the dentist.
To my knowlege most countries require at least two 'means of slowing' to be fitted to a bike by law. Not sure about Estonia but over here in the UK that usually means either two brakes (front and rear) or a front brake combined with a fixed rear wheel.
I drove only front breaks with BMX for years but that was long ago...
Any recommendations for good price/quality cog?