No, it's a useful distinction, because breaking the speed limit is something that can be enforced using more speed cameras, inappropriate speed for the conditions cannot: That needs more traffic police. The report allows a sensible discussion (if we could have one on this emotive subject) about where resources should be allocated to prevent this.
I agree - but the report downplays "inappropriate speed for the conditions" by ignoring it as the cause of most fatal crashes - losing control of one's vehicle, eg at a corner. They class this separately, but it is clearly driving too fast for the conditions.
The report is therefore a bit of a waste of time, and smacks of apologists for speeding.
Your conclusion, however, about more policing - I would be totally in favour of, but it aint going to happen under this coalition. Police numbers and resources will fall.
I would target inappropriate speeding / tailgating etc, by having random, unadvertised cops by the road - hidden - and radaring and videoing you.
The IAM report doesn't change anything - it's always been my view.
Speed cameras are a useful adjunct and I would increase their number in towns and cities, along with a 20 mph limit which the fixed cameras could enforce.
It would only need a few mobile stealth cops to hide out in country lanes capturing the really dangerous drivers if they popped up at a different spot at random. The deterrent would be the uncertainty rather than an increase in the number of traffic police.