Thanks for the feedback. I hope you're enjoying the aircraft, regardless of some of these things. I hope you don't mind if I answer in the form of a list, as I'm doing a lot of replies today.
The KAP 140 is incapable of driving a flight director, hence the lack of one. I could add an optionally toggleable one for you, but as you might imagine, then I will receive comments that this is "unrealistic".
Unfortunately, I don't plan on adding a different RMI to the Caravan, since this is the unit I have seen most commonly installed in Caravans. Also, I'm sure you also understand that I receive a lot of requests to put avionics from all my aircraft in all my other aircraft, which would be a practical impossibility. This is unfortunate, since I aim to make everyone happy.
I have been told by my Caravan pilots that a lot of rudder trim is required for cruise and any power changes, and also due to fuel imbalance. As the KAP 140 does not have authority over the rudder, I think this might be mostly realistic. I'll talk to my Caravan pilots to get their opinion.
I'm already working on this for v1.1. Unfortunately, there is no "click here to increase left-turning tendency" option when developing a CFD aerodynamics model, but one would think this is a solvable problem from looking at my other aircraft. Hopefully I can get this squared away for you guys by next week. Sorry it's not sooner, but Just Flight is on their way to FSWeekend in a matter of hours.
Thanks again, and let me know if you have any more comments or questions! You know where to find me.