Hybrid mode allows you to mix Scenes and Stomps, BUT it only lets you choose A-D together for one type of function and E-H for another. Personally, I use Stomps for A-D and Scenes for E-H. The manual describes how to set this up.
There are a lot of requests for new ways to reassign footswitches. Take a look at these two which I think sum up what people are asking for: