Pretty much all of our installation packages these days use the same frontend setup.exe bootstrapper project and therefore also use most of the same commands, even if they aren't specifically documented. First off, you can run setup.exe -? on them to get some of the commands specific to that package. Also, a good tip is to run a logged setup installation (Setup.exe -log "C:\logFolder") and you can actually see what paramaters setup is passing along to your msi's.
Basically all the installation packages that use this particular setup.exe have the same command paramaters as what is documented for Server/Client. INSTALLDIR, ACTIVATIONKEY, INSTALLLEVEL to determine which components to install (if you just want everything you can usually just put 1000 here) or LICENSEPATH, SVCACCOUNTNAME/SVCACCOUNTPASSWORD for services, etc... If you have a command line that works for Server or Client, there's a pretty good chance it'll work just like that for the others, you just might need to experiment a bit (and logging a representative setup run should help with that if something turns out to be non-obvious).
Now, this only applies to newer packages, like IA 8.1.3, WA 9.0, etc... Basically, if the setup.exe looks and acts the same as the Client/Server's, it will use the same parameters.