I can't comment on your original question but can direct you to the (never published cos i didnt have time) update to WebViewExtras:
http://b4a.martinpearman.co.uk/temp/WebViewExtras2_20131025.zip.
This new version of WebViewExtras (obviously) replaces the current version and it replaces WebViewSettings too.
When i created this new version many months back i went through all of the android WebView related classes and wrapped as many as i could.
So if you're creating a WebView based application you'll find it much better than the old versions of WebViewExtras and WebViewSettings.
The WebViewExtras.html file in that download documents all the available objects.
Lots of new classes to play with.
Martin.