I don't think RTS exists any more so there's not much to reclaim.
Having said that, I think there were some good bits there (I am not entirely pro!). The name, is a good example - cars dictate how large parts of urban and rural space can be used. If you try and walk around Milton Keynes, there are big fuck off signs everywhere saying "pedestrians do not have priority". The way cities are planned, and the spaces between cities, is not focussed on humans walking about, talking to each other, but on cars - generally transporting people to and from work.
The early RTS actions were extremely inventive and took place in spaces where they would receive good support - Camden High Street, Angel, the Westway. I was at the Westway one, and it was incredible to be part of something so full on - dodging past the cops to try and protect the soundsystems (I got there earlier than most) and then turning round to see thousands of people pouring down the road behind me with all the cars gone... it wasn't just ravers either there were all sorts of things going on.
I think RTS realised the limitations of the "party as protest" shortly after this - remember that they also held actions in solidarity with striking tube workers, and the march on Trafalgar Square which was done in conjunction with the Mersey Dockers. This sort of linking up of social movements is something I find incredibly exciting personally - people learning from each other and putting aside their differences to work together towards a common aim.
The Brixton/Tottenham event was piss poor however. I assume the idea was to get "local people" involved, but the nature of RTS events is that they have to be covert and organised by the usual suspects. Brixton was great but it was clear to me that the ideas were thin. They did get in some local soundsystems to play the occupied space tho, not just the crusty rave ones. And a mate of mine was involved with organising a kids play area, which I think is something good also - not just for your twenty somethings.
What I've heard about Tottenham was that it was pretty crap - people pissing in local people's gardens, loads of litter, etc.
Anyway, after that RTS went on to organise a huge event in the form of J18 in which the hordes decended on the Square Mile for a day. That event was also amazing from all sorts of perspectives - a total disruption of a sector of the finance industry, with a brilliant carnival atmosphere. The stuff of which legends are made. The entrance to the Liffe Building was completely bricked up, for example!
I suppose J18 became a new model which lead to the Mayday stuff. Which has become ritualised confrontations of little value.
One of the main criticisms of all this is that a lot of good people spent huge amounts of time preparing for one spectacular day, which people would then turn up to. But this changes little and can be managed easily by the powers that be. Sure, people perhaps get a glimpse of what another world could be like, but it often ends up with people showing up as punters for a party and doesn't lead anywhere else.
Personally I think the way forward now lies with deeper low level work on a more constant basis, at work, where you live, etc.