This doesn't seem to gel well with the HTTP verbs like PUT and DELETE. I also think the name is somewhat misleading. At first I read it as JSONP which is completely different.
I agree. But also ... just ... something inside me tells me this isn't a good idea. Instead of creating a whole new HTTP request like PATCH to merge all the requests at once, why don't you just send a JSON object to a script with an array of tasks that could be done on the server?