Hi Tobias,
>> Since oryx is not saving event based splits...<< If you encounter things like this _please_ raise a jBPM jira and use "Designer" as the component. This will drive fixes into the next version. For now I have opened one for you: https://issues.jboss.org/browse/JBPM-3361.
Regarding the other issue, if you can provide a full example that fails I could be able to add fixes for both issues in the next release which is targeted for early next week now.
Hope this helps.