Cutting Wide Timber on Compound Mitre Saw?

I would like to cut up to 80cm to 1M wide chipboard & mdf pieces as the compound mitre saw is the only thing I have that cuts square. I presume slide/cut as far as it will go one side, then turn the piece over and align the laser near the line exactly where is was. Is this pretty dangerous to do? As not only would the pieces need to be clamped down, but supports underneath the timber to keep it level. Would experienced operators even do this sort of thing?thanks