Migrating a 1/4 VGA web app from MC9xxx (PocketBrowser) to ET1 Enterprise Browser

Working with a partner and 3rd party software app that was developed to run either: 1) on our MC9xxx mobile computers in 1/4 VGA mode or 2) on an Apple iPod. We're trying to migrate the app to an ET1. The 3rd party software company requested user agent info for the ET1 which we provided, then subsequently they made changes increased their app to now fille about 1/2 the ET1 screen now (vs. 1/4 before). So far, this is all being done in Google Chrome on the ET1. Not sure if it's this simple, but could the PageZoom setting in Config.xml have an impact if we ran this same app in Enterprise Browser instead of Chrome? Thanks, Chris