Location Alarm Pro

I needed an app to remind me to pick up bags of dog poo! If I'm walking 10 miles there and back, and my dog does the business after the first mile, I don't want to carry the bag the whole way. I trialed 10 apps, and this is the best for the job. Accurate, and easy to set up if you use a preconfigured alarm. But I would like to be able to alter that alarm's location by snapping it to my location, instead of having to drag the map pin.