What you have to do is :
1. Create your 6 print scripts
2. Assign a shortcut to each script via the indesign interface.
As far as I know, you can't assign a generic shortcut that will work in every system for any user. But for your own use, you will be able to do it easily.
But considering the chance you mess yourself all the time ("oh gosh I didn't want to print the crops, it was ctrl 5 and no ctrl 4 !!!") I don't know if it's very more useful than ctrl P. Or for one print preset maybe...