Unfortunately our experience is that it is not possible to "Crtl End" to the last grid row on the web. You can change the default number of rows fetched at a time by using OMW to change the grid properties. However this then requires a package build and deployment (or you can make the change using the fat client on the web server) then regenerating the application for the web.
We are running what was formerly known as JDE OneWorld Xe, using an RS6000 AIX Enterprise Server with Oracle Database. Our web server is an intel box using websphere. We are on SP22j g1.