When Activity is enabled for a custom entity which has N:1 relationship to Contact, Account, etc which are valid activity recipient type, clicking on Add on wall control, for example, Add Phone Call shall automatically populate the To or From (depending on direction) with the Contact (or other valid recipient type) on the current form.

I have an Enquiry form with N:1 relationship to Contact, and wall control on the form. When clicking on the Add Phone Call, I would like the Call With to be automatically populated with the Contact. This shall be configurable (enabled/disabled), if there are multiple lookups, then I shall be able to choose to auto-populate from which relationship.