To clarify, say you have ten actions. You want to find all actions that Object1 is affected by. If that object is changed by even a single F-curve in a given action, that counts. Is there a way to do this via code?
If this isn't possible in the current version, I'm also considering a user solution in the form of a naming convention. For example, include the name of the target object in the action name, and that action is added to a list. But I'd prefer to be told that my initial approach isn't feasible before going about it that way.