Requirement is to be able to preconfigure the SP with updates to the metadata from which a fedlet is generated. Examples: signing, encryption certs, custom mappers. However, currently if the SP already exists when the fedlet is created, an error message is displayed: "A already exists. Go to the Federation tab, and delete the existing entity. Then you can return to reconfigure it.
The workaround for this is to:
a) let the fedlet wizard create the SP to get the war
b) delete the SP just created
c) recreate the remote SP with the URL I supplied to the fedlet wizard, using the custom metadata I created for this remote SP
d) update the SP custom metadata to be for an SP in hosted mode
e) update the fedlet.war inside the fedlet.zip with the hosted mode sp metadata
Better would be the ability to generate the fedlet from the existing SP configuration, ideally through ssoadm but also in the console.