Allow sub-process to be open with a double-click on plus icon in Stunner

It would be nice to have the ability to open the sub-process designer directly clicking on the "plus icon" in the sub-process (reusable element) Stunner. The plus icon should behave like a link to the sub-process definition.

Today you have to go to the asset explorer, locate the sub-process BPMN file and manually open it. This is time-consuming and not user-friendly.