www.installaware.com is an installshield like wrapper for MSIs.
Sharefile Drive Map software appears to have an installaware wrapper. The executable wrapper seems to accept a /s command line switch to enable it to install silently. the /s can be followed by standard MSI command line parameters to add transforms etc.
http://www.installaware.com/forum/viewtopic.php?p=13867&sid=e656bda69d62caac0d6f749da7939c88
