As a race organiser I do not welcome people joining in and doing their own thing nor I suspect do the majority of race organisers. I put the race on for people who want to enter, in doing so agreeing to abide by the rules which I specify and to race against everyone else who paid up and entered. In my experience unnoficial runners cause me problems, some of them even running through the finish funnel, how selfish is that. They should realise the problems they can cause and stay away.