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Hi Chew, glad you are using PI Connector for UFL.
1) There is no such a limit by default, it depends on many factors like a # of requests per second, if the whole message is processed like one line and also the hw configuration. But as a general recommendation, I would send requests with maximum size 1MB / 100 000 events. If the connector is not able to catch up with the payload you will receive an HTTP response with status=500 "The REST endpoint is overloaded; re-send". Then you should decrease the payload.
2) This is not supported. The connector doesn't know if the points exist or not, so it sends the data to the PI System and in case the point doesn't exist, it gets created automatically. I would recommend you to vote for this request on UserVoice: Feature to turn off auto creation of PI Tags in PI Connector for UFL – Customer Feedback for OSIsoft & the PI System