Hi Dan,
Thanks for your answer.
The ability to add schedule events does exist and works fine with the BI 4.x REST SDK, see
http://help.sap.com/businessobject/product_guides/sbo41/en/sbo41_webi_restful_ws_en.pdf, p305.
I've tested it and it works.
I'm just looking for a way to add a notification to the successful run of a schedule, which you can find in the Webi interface but not as an option in the REST http request, perhaps that's what you mean...
Andresson