It has been done and it can be done. You can probably do it as well as the street skating pros. For what you might see in magazines ect is litterally just being ballsy, almost no skill involved, and thats not something said to be harsh, just that it's not very possible to use any skill you have on bombing hills to help out with the bombing on a regular board.
The biggest issue are the small wheels a normal skateboard has. When wheels are small and very hard, especially on a small wheelbase, minor to mid-level road imperfections actually are something to be concidered when riding down a hill. This makes it actually a bad idea to keep 90% of your weight on your front foot like you should, as more weight on one place means those imperfections are felt more. This means something has to give, which often in the world of street skating leads to trucks being tightened. When your trucks are tightened- you can't really steer the board without standing in a way that has your feet, waist, etc close to perpendicular to the deck insteading of paralel over it. Many people don't turn very fast as it feels like turing fast will make them fall, this has some truth to it on tight trucks as your board may not be able to lean enough to keep up with your body leaning to turn. So now your stance is wrong, your manuvarability is horid, your weight is distributed in a way that leaves your speed wobles up to luck....
Not a good combo. To continue, on a regular setup, with regular wheels, slides have not much control due to the wheels, and won't slow you down very much, and just carving or changing directions at higher speeds you don't have much grip. Also a short wheelbase will add to the twitchy feel that gets you closer to speedwobbles. And the trucks have no method of helping you prevent speedwobbles.
