Can I emulate the trackwheel navigation of a blackberry app in an embedded browserfield?

Question

I am using an embedded Browser in a blackberry app to view a website customised for blackberries.

We're using this approach as we'd rather not invest in launching a native app that we can't change & distribute as quickly as a website for now.

The problem is I want to emulate track wheel focusing from field to field as in a native app

this guy puts it better possibly:

http://supportforums.blackberry.com/t5/Java-Development/Focus-navigation-in-BrowserField-in-OS5/m-p/594272#M122857

Except I'm going to have to do it in OS 4.6+

But sticking with OS 5 for now

cfg.setProperty(
    BrowserFieldConfig.NAVIGATION_MODE,
    BrowserFieldConfig.NAVIGATION_MODE_NONE);

Could I write my own code to achieve this?

Is this a dead end?