Well, I dont know about a flexideck, but I can assure you that you arent the only one with a motorized board. I have an official and original DirtSurfer*trademark* myself that i enjoy the hell out of as well. Doesnt do 100, more like 25mph, but it's still a cool toy.
You can watch an old photojam of it here...
You can check them out on this page...
And you can find videos of them in use at http://www.viza.com
NONE of the guys in the videos have the ballz to ride them like we do, but you can get the gist of it.