My gf and I both like toads. We live about 2 miles apart, and each do what we can to encourage our toad populations. We use due diligence when mowing, try not to use insecticides around our homes, and watch where we are walking (squish). Our dogs are trained to not mess with toads.
Is there anything else we can do to improve their situation/optimize their breeding success and survival?
Any toadophiles out there? 
If you’ve already got some toads around, then the general conditions must already be OK. Their population around your house will find a balance that matches the supply of bugs. Toads also need a place to sleep that preserves their body’s moisture somewhat. Natural garden mulch is good for this. Anything they can hide under to sleep which keeps them out of the sun and has a little bit of moisture in it will do. Dead leaves are also good.
Longer term, they need a body of water in which to breed. Often, toads breed in vernal pools which develop in depressions in forests during spring rains. These usually hold water long enough to allow the tadpoles to transform. Toads will use a permanent garden pond for breeding purposes as well. Make sure that there are no big fish in it. When I had an in-ground pool, toads and spring peepers laid eggs in the puddles on my pool cover. These usually hatched and transformed successfully.
Thanks Crotalus. We both have pretty much what you describe. Last year, we saved some broken clay flowerpots that we put around our yards (on their sides) partially buried in mulch.
Those sound good. What the toads need is a humid micro-habitat. They are terrestrial and can handle pretty dry conditions, but they need a hideout that helps them retain their body moisture while they’re sleeping.
Another thing you can do to maximize your local population: if you know where they are breeding, you can take some or all of the eggs indoors and raise the tadpoles to the point of transformation before releasing them. This will protect them from any aquatic or airborne predators in the natural environment. The small toadlets are still vulnerable, but less so than the tadpoles.
Just reading your thread title made my heart feel lighter. Not that I’m particularly a toad fan, but it’s nice to see someone wants to do something for them.
I did dig up this interesting article, which even discusses training them to stretch out in your hand for petting, should you be so inclined.
Please post an update on your toad population as the summer progresses. And may good karma hop your way!
Sailboat