Hi again 737NG,
first, I enjoy talking about these subjects since there is always something I haven't thought about, even after being on the NG since it was first delivered to my company in 1999.
As it was mentioned beforehand, there are several customer options, eg we are having 6 fix pages, IAN enabled... So we might fly the same aircraft but observe slightly different annunciation.
In our config, TMA remained in CRZ at 1600' AGL in the clean config. I might have a chance to try the GA AP engaged situation on Sunday, depends on ATC on my way to LPA.
I don't trust the SIM, it does not always represent the company config by 100%. And usually it's exactly these little gimmicks that are concerned.