Imprecise timing adjustment

Hi, Once there are a certain number of scenes, the timing adjustment starts getting imprecise and skips over the number you want. I have spent at least 5 minutes trying to make this layer 1 second, but it goes from .9 to 1.1 over and over. This is a huge time waster. If there's a way to manually input or adjust the timing, it's not obvious and the UI is lacking. Thanks