Thank you for the notice. We now hope for a fix.
I love the PC-12 but this restriction is enormous. Please fix ASAP 
Can confirm that connecting a USB mouse (USB-A if that makes a difference) directly to the front port of the PS5 let’s you edit the flight plan. For sure it is an ugly workaround and this “bug” should absolutely be fixed.
In fact an ugly workaround. We need a proper fix. I hope for one in SU5
Fixed in SU5!
Did a quick test, seems partially fixed. The line select keys still not work, but at least the touchinterface seems to work now, which seems fine.
Can you confirm the current status of the PC-24 ? Are there any bugs which is yet to be fixed ? How does it fare in career mode ?
Issue was fixed in SU 5.x