Obviously, you have no need to block the leader, but by the same token if you are on the pace of the leader you have every right to fight for the lead lap (not when you're trying to go from four laps to three laps behind).
This is actually a bit of a grey area. In real motorsports anyway, and Chris knows my credentials in that regard.
Anyway, in most series, if not all there are rules regarding a backmarker and the leader. In F1, if the leader catches you, regardless of how close to his pace you are, you have 3 showings of the blue flag before you are given a drive through penalty. In other series it is roughly the same, if the leader catches you and you are blue flagged, you HAVE to allow him past.
You cannot fight to keep your lap if you are impeding the leader, that is the truth of it. YOU ARE A LAP down, and the leader has CLEARLY caught you. So you MUST move . You under NO circumastances may you DEFEND your position from a driver who is lapping you.
HOWEVER, this is why it's a grey area. There are no rules against passing the leader and gaining your lap back. As long as it is done cleanly and you then scamper off into the distance without getting in the leaders way and/or influencing the outcome of the race by putting the leader off the road.
OUR biggest issue is that we do not have someone issuing blue flags, nor do we have someone acting as race control and steward during the race so we need to make these judgements ourselves as we race.
All we can really do is explicitly write out what is and isn't allowed with regards backmarkers and what would be considered a blue flag in the real world, and call out a penalty for circumvention of that rule. But I'm not sure how any of this can be applied real time as we are all racing.
Best I can suggest is we lodge an appeal system where the driver who has a complaint needs to submit an incident for review post race. Ie I got dumped buy so and so on lap six at corner 10. Then the series coordinator, Jonerz, can find that specific incident and make a judgement. Obviously all judgements will be either a predetermined time penalty applied post race or an outright DQ.
That is my suggestion for the day for what it's worth (I still refuse to give Chris $0.02)
Rob