Passports/ID are now all been scanned on arrival (phased basic started this month).
Travelled into Dublin between Christmas and New Year, immigration was a joke. Best part of 1000 people queuing in T1 immigration area with half the booths closed plus another queue back up the stairs and onto the escalator (thankfully turned off).
When getting to a booth the passports (multiple ones) were looked at for 10 seconds total, no scanning or checking or anything. That is not Immigration control.
Kind of like normal weekend Stansted.
The distance between Gate and Immigration is an issue (not just at Dublin) hence maybe a mobile immigration unit to sit at a particular gate/(s) where passengers checked soon as they get off a plane and then full immigration again in normal place.
In many smaller airports there is no where to hide/wait for hours post get off until approach immigration, in the bigger ones there is.