The simple sollution would be to require that all multi-socket devices carry over current protection at a rating appropriate to the socket outlet it's going to be plugged into.
i.e. 13A in the UK/Ireland and Denmark
16A in CEE 7/7 countries.
10A in Australia / NZ
I have never seen a powerstrip cause a problem here. The only thing I've seen melt and catch fire is an extension reel which was fully loaded and not uncoiled. They should be designed to withstand a bit more heat or at the very least have a temprature trip out on the reel housing.
