I experience a lot of the same problems getting keywords to access the corresponding patches or just finding the keywords in a manual. In the strings expressivo is suppose to trigger the exp string patch but it doesn't you have to use molto vibrato.What would really help is to add a mouse over function to a patch that would open a window telling you what keyword to use in the Sibelius score that would eliminate the use of a separate manual.
Thanks,
Stephen W. Beatty