The EGPWS requires a "look ahead" and thus is more complicated which I didn't have time for yet. TOO LOW FLAPS should work though... TCAS is a totally different story, this requires several changes to the traffic system which we also did not have time for yet.
EC135 bearpaws are optional in the real world as far as I know. You don't need them to land on a hard surface but on soft surfaces they are of great value of course.
There are many features in the A320 that are not implemented yet, we are improving this aircraft over time and there have been many requests in the past. Please keep in mind that we have a lot of other aircraft as well and that we cannot dedicate as much time to one aircraft as add-on developers to for their products. I'm not a fan of creating a list of missing features because that may suggest that we as developers are going to implement exactly that list which is unlikely and that may disappoint users. Also who is going to update that list if something gets added...?
I can make a list and keep it updated like the other list I made with ideas for aerofly and if someone has an idea I will add it to the list and I will name it possible ideas so it's not 100% confirmed but an idea