Process based Pool missing in Enterprise BPMN Collaboration diagram

Pool object is implemented currently as new abstract object type. From BPMN 2.0 standard perspective represents Process, IT system, Business function etc.

There is strong business needs (from tousends modelers) to use derived / dedicated Pool types - e.g. Process Pool. This is analogicaly the same situation in comparision with Lane object type and its derived Role Lane, Org. unite Lane etc.

We need to be able to re-use existing Process elements (function object type) from Process hierarchy structure and as (Process pool) occurence put into BPMN model - to model Internal pool representing the main process and also External pools - representing Process interfaces for navigation to other process. Curretn state leads to redundancy, because abstract Pool have to be created redundantly incl. the assigments navigitating to the existing process models. So modelers fifht with redundancies and a lot of effort to keep Pool structure and Process structure 1:1.