I use Fast Track turnouts where the frogs are live and never have a problem with stalling. The Caboose Industries (CI) hand throws that Fred mentioned above are the 222S ground throws. When wired correctly they change the polarity of the frog when you move the switch.
If you already have turnouts installed, it shouldn't be that big a deal to solder a wire to the frog and drop the wire through the layout top. Here's a handy diagram on how to do that from the Fast Tracks web site. The wiring will be the same whether you use a 222S ground throw, a Blue Point manual throw, or a Tortoise switch machine.
Hope that helps...