I realize in your case, being out of state, having a PM is a necessity, but I'm speaking more in general terms.If this is the only complaint you have with the PM, I wouldn't look to change to a new PM. 

Repairs cannot be arbitrary: they have a checklist of very basic necessities, and if something doesn't meet that, they make you fix it.

But, how do you explain the necessity to invade their homes every 3 months?

They have dropped in cost and the Smartkey feature seems to come standard with most Kwikset locks now.The cost and the necessity ...

With the direction i am looking to go in now that is going to be a necessity.

Once you get over the $100 mark, then it becomes sort of a necessity. 

And if they do work as hard as I have, it will most likely be through choice, rather than necessity. 

We are finishing up prepping our Airbnb property for renting. We are curious, what needs to be there and what is just too much extra? How many of you guys put in a microwave, minifridge, and other amenities like that?...

First, though, they'd have to sue you to enforce an easement by prescription or necessity that hasn't been recorded (easement created by long-term use, or as a way to get to their own property, which is basically not reachable by any other reasonable means).  

Once the animal becomes a "medical necessity," they are no longer an animal in the eyes of the law, they're basically a medical tool like a wheelchair (as mentioned) so you can't charge a pet deposit for them.