I can force run an MSI app, and I can force cache an MSI app, but is there
a simple way to force install an MSI app from the cache? If I turn on
force run and force cache, it appears that the MSI file is cached on the
machine, but the install runs from the path in the sources list.

I have several things (like the .Net Framework) that are just purely
installs and have nothing for the user to run. I have them workstation
associated and want them to push into the cache and then just install from
there. Installing from the source location can be very slow for remote
users - I'd rather just get the file there and then start the install.