Unfortunately no.ACS only offers the text input field here

Good evening from Adobe Basel / Switzerland 

You could do that using a typology rule.You may look at the standard rule "Check unsubscription link" as a started for this

In reporting, drag the "Variant" dimension on top of the delivery for which you want to see the numbers.

Then indeed it's not easy to check. I guess then a support ticket to get the logs on server side may be the best option

You could drag "Message Type" below the Segment Code field in reporting to see channel statistics

Can you check few things: * Does it show the parameter including the profile ID in the URL of the landing page? * Do you use Organizational Units in your ACS instance?

I dont know of any enhancement.You could just raise one via the admin console. The only thing I do see a benefit on this:Add a new user to a notification group (then they receive the mails without a login)Remove users and prevent them getting notifications

yes there is currently indeed no way to remove them. You can set the account to disabled to prevent any notifications etc being sent to their address

Did the whole delivery fail or just for 1 recipient?It rather sounds like delivery preparation failed, so you would need to check the "Log" tab on the deliveryIf that step fails, no delivery logs would be created