Looks like our best option is 100 or so word README either in the docs or in the source. Maybe also creating an installation script.
Talking with Matthew Jones he suggested that in Sakai 11, jQuery is available everywhere so it should be easy to install. It's a little harder to do in Sakai 10 (in the interest of local work "today" or a possbile 10.6) because jQuery isn't always available in 10.
In Sakai 11 it would be placed in one location for source and another for binaries.