In my case, I'm taking about installing an update over an existing PT2010 installation. The install settings that I have to manually enter each time include the Program Files folder name (I don't include the year), the shortcut name (I don't include the year), the option to install the malware feature, the option not to install non-English language handbooks, and whether and where to install shortcuts.
While I'm on the subject, the requirement to uninstall the prior year's program (here, PT2009) could be built into the install routine for the current year's program (here, 2010). Even Java finally got around to incorporating this after many years of permitting installation of multiple iterations of itself.