The DS (any - 1, 2, or 3) is perfectly capable of running! I assume from your post you are "non-spinnaker"?
But, there are tricks:
1. Set up your rig for wing 'n' winging with a whisker pole. This can be basically anything that you can hold the jib clew out to one side or the other with. Mine is a simple 1" diameter aluminum pole with hooks on the ends. There is a ring on the front of the mast that is positioned at a height such that the pole is at 90 degrees to the mast when the jib is poled out. I also made my jib sheets longer so the lazy one still has some slack in it. I used to have to re-route the working sheet outside the shroud, but now I don't have to do that since I use the barber inhauler to keep it from chafing on the shroud ...
2. The boom/main does not need to be at 90 degrees to be effective, but it does need to be as flat as possible. This means halyard, outhaul and vang tight. Some contact with the shrouds is OK, as long as there is not a lot of up and down movement of the sail on them. Make sure you have spreader boots or some other means of protecting the sail from the nasty sharp bits in this area. Also, a preventer helps alot. Mine is a simple snap shackle mounted to the underside of the boom, right where it meets the shroud when it's out there. I clip it on, then sheet in the main just enough to take out the slack. Beware tho: you really better know when to pop that thing off there, cuz things could get really interesting in an uncontrolled gybe with it on!
3. When runnning, pull the CB all the way up, and get all skipper (and crew if you're lucky enough to have them) weight as far aft as possible.
4. Some kind of tiller tamer comes in really handy. Doesn't have to be fancy: mine is simply one of those black rubber bungee cords stretched across the stern, and a jam cleat on the bottom of the tiller. Just set it amidships - you will do most of your steering downwind by shifting from side to side ...
Some of my fastest boat speeds have been running, here in FL on an east-west lake with a nice evening seabreeze filling in. Oh, but you ask, how do I stop? Well before I get to the opposite shore, I get ready: CB down (pretty easy even at higher boat speeds while running, since there are no side loads on it), pop the preventer and tiller tamer, then slowly turn the boat into the wind into a hove-to position. If the jib is out to stbd and the main to port, I'll turn stbd, and vice versa. This puts you into a sort of "neutral" position that gives you time to unhook the whisker pole and sheet the jib to weather for the normal hove-to position. Main is all the way out, with the preventer off. Gotta act fast tho, as you'll be going backwards in a hurry if you don't! ;-P