You can't book to Midleton currently, Irish Rail seem to think you can but you can't, yes the seat reservation people are aware of this now.
Even when it works you won't be able to start from Midleton until the TDM/TVM integration software thingy is finished as you can't collect a ticket in Midleton yet
The TVM's appear to run some class of windows, but really its becoming a bit of a running joke the machines should work all the time, both of them.
Forget the platform displays until the signaling system is completed they won't work
All departures in Midleton should be off platform 1, it allows a faster arrival and departure
There is certainly a combined bus and rail ticket which includes Midleton