Tried
Soluto, but it wasn't particularly happy on the box where I installed it
.
I did find the registry key I was seeking: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System.VerboseStatus - VerboseStatus had to be added as a DWORD - value 1 shows status, 0 does not.
This doesn't show actual boot status,
i.e., before login, but shows more detail after login. Dunno that it's all that useful, but it is kinda nice to know why so much time elapses between password entry and application load start
. And it has shown me update hangs a couple of times, so I at least had a starting point for problem resolution.