Non Microsoft .msi's and install mode

I'm trying to confirm something about msi files and install mode for session hosts.

Everything I am reading always states that msi files from Microsoft will automatically put a session host into install mode and back during installation.  So does that mean msi files not from Microsoft may not do this?

I'm mainly looking for 3rd party programs like Java, flash and reader.  If any msi automatically does it, great.  If that is a setting that isn't guaranteed from non Microsoft sources, is there a way to confirm if the installers they use will put a session host in install mode?

Thanks