You can include it with the package by using Packager -AddScript [script_filename] [event_name] [wait/nowait] [package_file], e.g. Packager -AddScript C:\scripts\mapdrive.vbs OnStartUnvirtualized wait C:\packages\appname.cameyo.exe
Notes:
default location of Packager is %appdata%\VOS\Cameyo\PROG\%Program Files%\Cameyo
if you type an invalid event name, you will see a display of all possible event names