After the most recent update resetting the controller bindings (.84c), I’m not able to customize key bindings anymore. If I attempt to set Use Ability 1 to Left Trigger, it tells me that it’s already in use. I then select replace, at which point all bindings disappear from the controller. I then attempt to rebind ability 1 to left trigger, at which point all bindings re-appear, as their default values.
If I could find the file where bindings are kept, I’d edit them by hand, but I haven’t been able to locate it.