Since JSPs are dynamically converted into servlets, it is not possible to give init paramaters for a particular JSP. However, if you precompilation like JSPC, then it will generate a xml file which you would need manually copy paste its contents to web.xml. In this case you can give the init parameters for each JSP file.
The jspInit method is provided by the jsp convention. It's not the equivalent of the servlet init method, rather it provides the similar opportunety to do your initialization work. The servlet's init method still exists and lives well inside jsp. The reason jsp doesn't inherit directly, instead offers the jspInit, is that it wants to make sure the execution of init() is proper without being diverted accidentally by non-experienced programmers. If you want the config, override the init method.