Custom properties for Tasks

We want to use "Tasks" more intensively to register and measure all marketing and sales activities.

But we cannot create a user-defined Property - please make this available.

It should also be possible to see "Tasks" on the contact card on the right together with Deals, Tickets and other info.

In Calls you are using "Type" and "Outcome"  which is something that could be used but not only on calls but on all activities / tasks