You don't need to wait for Domoticz to allow the patch. You can easily change it yourself. If a better solution comes in hand you can remove the old patch done by yourself and override it with Domoticz's solutions again.

The problem with a general patch to change the User Agent for the Toon in Domoticz is that the new User Agent string can easily be blocked also.
I'm thinking of letting the users choose their own User Agent string in the config of the Toon hardware in Domoticz. Any other ideas?