For the second part of your question where you are looking for Inbound Throttling of Inbound Message, you can use the below property:
There is an JCA Service Binding Property which can be used to control the speed at which the adapter posts messages to BPEL .
This setting ensures that there at least will be 1000 milliseconds delay between the two consecutive messages being Consumed by JMS Adapter and being posted to BPEL.
Few points to remember is that this setting pertains only to BPEL, and only to one adapter polling thread.
If multiple adapter polling threads (e.g. multiple JMS dequeuer threads) have been configured, this setting will control the speed of each thread, not the combined speed.
Thanks and Regards,