[Bendy]

Does anyone know if it is possible to add parameters to a shortcut (or use run command) to run a program in landscape/portrait mode?

End if it was to change the screen orientation when the program is run, then change back to default when program is exited

[infernal]

i'm afraid there's no way to do so by command-line parameters but SKSchema can easily do it for you.

install it
create a script for it. a shortcut will automatically be created for the script
assign an icon to the shortcut
use the created shortcut

if you need further help, don't hesitate to ask.