You are correct. Package level code assist is not currently implemented in the JSP editor. I’ve entered an enhancement request for it in our internal tracking system.
As a workaround, you might like this. Just type the name of the class you want and hit code assist at the end of the name. An import for the class will be added for you, which is quite nice. This works around the issue and gets all those long package names out of your code. For example:
<%
Collection<ctrl+space>
%>
–Scott
MyEclipse Support