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@Momentum
There are three main problems with only running a front brake on SS:
If the cable snaps you have to use some sort of funky manoevure to stop (e.g. foot onto back wheel). If you are careful with maintenance, replace any old cables currently in the bike and learn an emergency stop method before you need it then you should be ok.
A front brake provides most of the stopping power on a dry, flat surface. You really need a rear brake (or some form of rear wheel braking) as soon as you get onto oil, gravel, water or ice or as soon as you have to brake on a corner. Using a front brake in these situations leads to a much greater chance of a front wheel skid and that will put you on the ground before you've realised what's happened. Again you can help to address this with a cautious approach.
It's not legal, although I think this doesn;t matter compared to the two above.
Basically you can run just a front brake but you should be aware of the increased risks and make sure that you address them.