The run as admin message only appeared in 051 plugin, or at least it did for me, 052 came out not long after and I am not sure what the changes were in that plugin, I had thought maybe it was the message but alas not to be. Its a PITA but certainly not a deal breaker for me as the IP-A is simply the best controller I have used with Mach and to be honest if you think support from CS-Lab is poor you really dont want to try some of the others

I am not making excuses for empty promises but I do know they have a lot on their plate at the moment with the work to get the plugin for Mach4 done, so I can imagine that programmers time is stretched at the moment.
What is the reason you need less than 0.001" step? I think the 0.01mm in my case is fine although I could actually get 0.001mm if I required as if using metric and choosing the x1 x10 x100 scale I would get 0.001mm 0.01mm and 0.1mm, I just dont feel the need for it for what I do. I am thinking however if you need it for a specific task it may be possible to work around it, but depends if its just a single move you require or a few of them in short succession.
Regarding the servo alarm, depending on your setup that should be a relatively easy thing to do, I have something similar on my Chiron.
Hood