i can understand you dont wouldnt want the thing thrashed thru every change and launch. but to limit it completely to stop you from enjoying it defeats the purpose. you'd have to find some way around that problem, GPS tracking etc wouldnt work for many reasons. or the cops would already have ever car rigged with it and making a killing on speeding fines.
i looked into hiring a Fezza, or 911 in Melb to do the great ocean road for our honey moon but,
most of the prestige/sports cars that rent for that sort of money and more have the previously mentioned 100-250km a day limit (lost my business, i like driving). but there are also have age limits of 30+ on some, so your pretty safe there in not getting young wipper snappers who are going to crash it.
you can go over the KM limit, but it cost you umpteen dollars extra per KM, and you obviously have to pay for the fuel then too. it just all becomes to ridiculous.
the way i see it, if you can justify that amount of money + the extra cover for insurance etc etc to hire something like this for only a day or two...chances are you can buy your own unless of coarse your overseas for a holiday.